title
Qt Tutorial 2 : C++ Calculator

description
Get the Code : http://bit.ly/qt-tut2 Best Qt Book : https://amzn.to/2KvFTsQ https://www.patreon.com/derekbanas MY UDEMY COURSES ARE 87.5% OFF TIL January 16th ($9.99) One is FREE ➡️ Python Data Science Series for $9.99 : Highest Rated & Largest Python Udemy Course + 56 Hrs + 200 Videos + Data Science https://bit.ly/Master_Python_44 ➡️ C++ Programming Bootcamp Series for $9.99 : Over 23 Hrs + 53 Videos + Quizzes + Graded Assignments + New Videos Every Month https://bit.ly/C_Course_44 ➡️ FREE 15 hour Golang Course!!! : https://bit.ly/go-tutorial5 (100 Available) The most requested next C++ app you guys asked for was a calculator, so here it is. We'll make a C++ GUI Calculator app in one video. Along the way we'll learn a lot! We'll cover a topic which confuses many people which is how to setup event handling with Signals and Slots. We'll also cover how to work with widgets in many ways, setting up an interface, stylesheets, casting, regular expressions and much more. Brought to you thanks to contributions from my Patreon subscribers such as https://perl6.org/

detail
{'title': 'Qt Tutorial 2 : C++ Calculator', 'heatmap': [{'end': 115.619, 'start': 91.524, 'weight': 1}], 'summary': 'This qt tutorial video series covers creating a complete gui calculator, including interfaces, web color styling, ui button naming, array creation, signal assignment, implementing calculator functionality, and calculator display manipulation, with detailed instructions and code available in the description.', 'chapters': [{'end': 36.693, 'segs': [{'end': 36.693, 'src': 'embed', 'start': 0.595, 'weight': 0, 'content': [{'end': 4.256, 'text': 'Well hello internet and welcome to part two of my QT video tutorial.', 'start': 0.595, 'duration': 3.661}, {'end': 10.978, 'text': "Today I'm going to create exactly what you guys asked for in the last tutorial, which is a complete GUI calculator all-in-one video.", 'start': 4.316, 'duration': 6.662}, {'end': 17.499, 'text': "I'm also going to talk about interfaces, style sheets, slots, and signals, which were basically QT events or event handling.", 'start': 10.998, 'duration': 6.501}, {'end': 20.3, 'text': "I'm going to talk about widgets, how to search for widgets by name.", 'start': 17.779, 'duration': 2.521}, {'end': 23.861, 'text': "I'm going to talk about casting, regular expressions, and the grid interface.", 'start': 20.32, 'duration': 3.541}, {'end': 28.965, 'text': "Like always, all the code is available in the description underneath the video, and I have a lot to do, so let's get into it.", 'start': 24.201, 'duration': 4.764}, {'end': 36.693, 'text': "Okay, and here is Qt, and I'm going to come in here and click on New Project, and I'm going to have it be a Qt Widgets application.", 'start': 29.226, 'duration': 7.467}], 'summary': 'Creating a complete gui calculator in qt tutorial with focus on interfaces, style sheets, slots, signals, widgets, casting, regular expressions, and grid interface.', 'duration': 36.098, 'max_score': 0.595, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo595.jpg'}], 'start': 0.595, 'title': 'Creating a qt gui calculator', 'summary': 'Covers creating a complete gui calculator in a qt video tutorial, including interfaces, style sheets, slots, signals, widgets, casting, regular expressions, and the grid interface, with all code available in the description.', 'chapters': [{'end': 36.693, 'start': 0.595, 'title': 'Qt gui calculator tutorial', 'summary': 'Covers creating a complete gui calculator in a qt video tutorial, including the discussion of interfaces, style sheets, slots, signals, widgets, casting, regular expressions, and the grid interface, with all code available in the description.', 'duration': 36.098, 'highlights': ['The tutorial covers creating a complete GUI calculator, as requested in the last tutorial, and includes discussions on interfaces, style sheets, slots, signals, and widgets.', 'The tutorial also covers topics like casting, regular expressions, and the grid interface, providing a comprehensive guide to QT application development.', 'All the code discussed in the tutorial is available in the description underneath the video, offering practical resources for viewers to implement the concepts discussed.']}], 'duration': 36.098, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo595.jpg', 'highlights': ['The tutorial covers creating a complete GUI calculator, including interfaces, style sheets, slots, signals, and widgets.', 'It also covers casting, regular expressions, and the grid interface, providing a comprehensive guide to QT application development.', 'All the code discussed in the tutorial is available in the description underneath the video, offering practical resources for viewers to implement the concepts discussed.']}, {'end': 555.325, 'segs': [{'end': 91.344, 'src': 'embed', 'start': 60.146, 'weight': 0, 'content': [{'end': 62.287, 'text': 'And here is everything all created here.', 'start': 60.146, 'duration': 2.141}, {'end': 65.569, 'text': "And I went and enlarged the fonts and I'm going to come in here.", 'start': 62.708, 'duration': 2.861}, {'end': 67.17, 'text': 'This is basically a standalone video.', 'start': 65.609, 'duration': 1.561}, {'end': 69.191, 'text': "You don't need to watch part one to understand this.", 'start': 67.19, 'duration': 2.001}, {'end': 74.014, 'text': "I'm going to come over here to forms and calculator and show you how to set up everything.", 'start': 69.231, 'duration': 4.783}, {'end': 81.939, 'text': "Very first thing I'm going to do, I'm going to have this be a grid layout, but I prefer to first add an item and then go from there.", 'start': 74.234, 'duration': 7.705}, {'end': 86.802, 'text': 'Alright, so what am I going to add here? Well, I need a basic display for my calculator.', 'start': 82.179, 'duration': 4.623}, {'end': 91.344, 'text': "If you want to see what the finished calculator looks like, all you need to do is go to the very end of the video and you'll see it.", 'start': 86.842, 'duration': 4.502}], 'summary': 'Creating a standalone video demonstrating how to set up a calculator with a grid layout.', 'duration': 31.198, 'max_score': 60.146, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo60146.jpg'}, {'end': 120.382, 'src': 'heatmap', 'start': 91.524, 'weight': 1, 'content': [{'end': 97.307, 'text': "So what am I going to need to use right here? Basically, I'd like to use a line edit.", 'start': 91.524, 'duration': 5.783}, {'end': 98.848, 'text': "I think that's going to work out good.", 'start': 97.328, 'duration': 1.52}, {'end': 100.529, 'text': "I'm just going to drop that inside of here.", 'start': 99.008, 'duration': 1.521}, {'end': 106.973, 'text': "Then I'm going to come down here and I'm going to right click and I'm going to go layout and I'm going to say layout in a grid.", 'start': 100.729, 'duration': 6.244}, {'end': 108.014, 'text': 'And there we go.', 'start': 107.433, 'duration': 0.581}, {'end': 110.355, 'text': "And then I'm going to select our line edit again.", 'start': 108.034, 'duration': 2.321}, {'end': 115.619, 'text': "And then I'm going to come over here to have it basically look good on the screen.", 'start': 110.735, 'duration': 4.884}, {'end': 120.382, 'text': "I'm going to come over here to horizontal and it's set for expanding.", 'start': 115.639, 'duration': 4.743}], 'summary': 'Using line edit and grid layout for screen design.', 'duration': 28.858, 'max_score': 91.524, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo91524.jpg'}, {'end': 227.624, 'src': 'embed', 'start': 196.531, 'weight': 1, 'content': [{'end': 199.673, 'text': "So basically I'm just going to drag all these in here underneath.", 'start': 196.531, 'duration': 3.142}, {'end': 203.274, 'text': "So there's another set of push buttons and more.", 'start': 199.893, 'duration': 3.381}, {'end': 210.057, 'text': "And I'm basically going to set it up so that I have five wide and then finally they are going to be four deep.", 'start': 203.714, 'duration': 6.343}, {'end': 217.821, 'text': 'And for the line edit up here I can just drag it into position so that it fills out all of the screen because otherwise it would look really stupid.', 'start': 210.397, 'duration': 7.424}, {'end': 227.624, 'text': "And then I'm gonna come in here and I'm just gonna hold down my command key as I go and click on everything to select all of these different guys.", 'start': 218.041, 'duration': 9.583}], 'summary': 'Setting up layout with five wide and four deep, and positioning line edit to fill the screen.', 'duration': 31.093, 'max_score': 196.531, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo196531.jpg'}, {'end': 260.687, 'src': 'embed', 'start': 236.267, 'weight': 2, 'content': [{'end': 245.65, 'text': "I'm going to first though, however, horizontally, I'm gonna set these for preferred and I'm gonna set vertical policy also to preferred.", 'start': 236.267, 'duration': 9.383}, {'end': 247.872, 'text': 'And you can see how those all set up.', 'start': 246.19, 'duration': 1.682}, {'end': 249.634, 'text': "I'm going to let's go.", 'start': 248.253, 'duration': 1.381}, {'end': 254.259, 'text': "Well, while I have this selected, I'm going to go in and style all these buttons as well.", 'start': 249.774, 'duration': 4.485}, {'end': 260.687, 'text': 'So what we can do is come down here where we see style sheets over here on the corner.', 'start': 254.8, 'duration': 5.887}], 'summary': 'Styling buttons horizontally and vertically as preferred.', 'duration': 24.42, 'max_score': 236.267, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo236267.jpg'}, {'end': 328.637, 'src': 'embed', 'start': 300.893, 'weight': 4, 'content': [{'end': 304.536, 'text': 'And I might change some of the other colors, though, just to make them look a little bit different.', 'start': 300.893, 'duration': 3.643}, {'end': 311.962, 'text': 'And the background color, you just come in and you do a number sign and C-O-C-O-C-O.', 'start': 304.896, 'duration': 7.066}, {'end': 315.686, 'text': "And I'm going to put a semicolon after that.", 'start': 312.943, 'duration': 2.743}, {'end': 319.569, 'text': 'And I can change the border like you might think.', 'start': 316.246, 'duration': 3.323}, {'end': 323.192, 'text': "And let's say that I want to have that be a solid gray.", 'start': 320.15, 'duration': 3.042}, {'end': 325.615, 'text': "You could also use a wiki color there if you'd like.", 'start': 323.212, 'duration': 2.403}, {'end': 328.637, 'text': "And I'm going to throw in some padding.", 'start': 326.215, 'duration': 2.422}], 'summary': 'Discussed changing colors, background, border, and adding padding to the design.', 'duration': 27.744, 'max_score': 300.893, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo300893.jpg'}, {'end': 377.796, 'src': 'embed', 'start': 348.394, 'weight': 5, 'content': [{'end': 351.876, 'text': "Alright, so let's also do, let's do a paste inside here.", 'start': 348.394, 'duration': 3.482}, {'end': 360.001, 'text': "You're also going to be able to change if the button is pressed on and I'm going to use like an A9, A9, A9.", 'start': 351.916, 'duration': 8.085}, {'end': 367.805, 'text': 'Okay, so A9, A9, A9 and just leave everything else be basically the same.', 'start': 360.021, 'duration': 7.784}, {'end': 369.226, 'text': 'Alright, so that looks good.', 'start': 368.065, 'duration': 1.161}, {'end': 369.847, 'text': 'all right.', 'start': 369.446, 'duration': 0.401}, {'end': 370.748, 'text': 'so click on.', 'start': 369.847, 'duration': 0.901}, {'end': 377.796, 'text': "ok, and you can see all those colors went and changed and let's now come in here and i'm gonna,", 'start': 370.748, 'duration': 7.048}], 'summary': 'Demonstrating changes using a9, a9, a9 for button press.', 'duration': 29.402, 'max_score': 348.394, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo348394.jpg'}, {'end': 489.959, 'src': 'embed', 'start': 465.994, 'weight': 6, 'content': [{'end': 473.62, 'text': "And let's say that we want to do something like Arial and we want to do 18 maybe and bold.", 'start': 465.994, 'duration': 7.626}, {'end': 476.382, 'text': 'And that looks all right.', 'start': 474.641, 'duration': 1.741}, {'end': 480.526, 'text': 'So it looks a little bit better, but I want it on the right side of the screen.', 'start': 476.723, 'duration': 3.803}, {'end': 486.65, 'text': "And to have that set up, you just do alignment and it's aligned to the left right now.", 'start': 481.166, 'duration': 5.484}, {'end': 488.332, 'text': "Let's align it to the right.", 'start': 486.751, 'duration': 1.581}, {'end': 489.959, 'text': 'All right, so that looks good.', 'start': 488.757, 'duration': 1.202}], 'summary': 'Formatting text to arial, size 18, and bold, then aligning it to the right side of the screen.', 'duration': 23.965, 'max_score': 465.994, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo465994.jpg'}], 'start': 36.753, 'title': 'Creating interfaces and web colors styling', 'summary': 'Covers creating a calculator interface with grid layout and push buttons, along with instructions for styling. it also explains web color styling, focusing on co, a9, and gray colors, and applying padding of around five pixels.', 'chapters': [{'end': 277.076, 'start': 36.753, 'title': 'Creating a calculator interface', 'summary': 'Demonstrates creating a calculator interface with a grid layout, line edit for display, and multiple push buttons, with instructions for styling and positioning, and no need to watch part one to understand.', 'duration': 240.323, 'highlights': ['Creating a calculator interface with a grid layout The chapter demonstrates setting up a grid layout for the calculator interface, providing a structured layout for the components.', 'Using line edit for display and multiple push buttons Instructions are provided for adding a line edit for display and multiple push buttons for the calculator interface, enhancing user interaction.', 'Instructions for styling and positioning components The chapter provides guidance on styling the components, including setting preferred horizontal and vertical policies, and proper styling using style sheets.', 'No need to watch part one to understand The chapter emphasizes that this is a standalone video, indicating that prior knowledge from part one is not necessary to understand the content.']}, {'end': 555.325, 'start': 277.076, 'title': 'Web colors styling tutorial', 'summary': 'Explains how to change background colors, borders, padding, and text styling using web colors, with a focus on using co, a9, and gray colors and applying padding of around five pixels.', 'duration': 278.249, 'highlights': ['Explanation of changing background colors, borders, and padding using web colors The chapter provides instructions on how to change background colors using CO, CO, CO, and borders using a solid gray, and applying padding of around five pixels.', 'Demonstration of changing button colors using A9, A9, A9 The chapter demonstrates changing button colors using A9, A9, A9, with a focus on making the button appear pressed.', 'Explanation of changing text styling using Arial font, size 18, and alignment The chapter explains how to change text styling using the Arial font, size 18, and bold, and demonstrates aligning the text to the right side of the screen.']}], 'duration': 518.572, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo36753.jpg', 'highlights': ['Creating a calculator interface with a grid layout The chapter demonstrates setting up a grid layout for the calculator interface, providing a structured layout for the components.', 'Using line edit for display and multiple push buttons Instructions are provided for adding a line edit for display and multiple push buttons for the calculator interface, enhancing user interaction.', 'Instructions for styling and positioning components The chapter provides guidance on styling the components, including setting preferred horizontal and vertical policies, and proper styling using style sheets.', 'No need to watch part one to understand The chapter emphasizes that this is a standalone video, indicating that prior knowledge from part one is not necessary to understand the content.', 'Explanation of changing background colors, borders, and padding using web colors The chapter provides instructions on how to change background colors using CO, CO, CO, and borders using a solid gray, and applying padding of around five pixels.', 'Demonstration of changing button colors using A9, A9, A9 The chapter demonstrates changing button colors using A9, A9, A9, with a focus on making the button appear pressed.', 'Explanation of changing text styling using Arial font, size 18, and alignment The chapter explains how to change text styling using the Arial font, size 18, and bold, and demonstrates aligning the text to the right side of the screen.']}, {'end': 990.297, 'segs': [{'end': 601.068, 'src': 'embed', 'start': 555.325, 'weight': 0, 'content': [{'end': 557.727, 'text': 'so we have everything looking pretty good there.', 'start': 555.325, 'duration': 2.402}, {'end': 565.152, 'text': 'Now what I want to do is I want to change the text for all of these different buttons to something that looks a little bit better.', 'start': 558.007, 'duration': 7.145}, {'end': 567.713, 'text': "So I'm going to come in here and select that guy right there.", 'start': 565.172, 'duration': 2.541}, {'end': 571.716, 'text': "And I'm going to just change its name to Button 7.", 'start': 568.093, 'duration': 3.623}, {'end': 578.52, 'text': "And I'm going to do that for all of the different buttons on here so that they all make sense.", 'start': 571.716, 'duration': 6.804}, {'end': 584.461, 'text': 'Okay, so now you can see that I have button 0, 1, 2, 3, the whole way through 9.', 'start': 579.119, 'duration': 5.342}, {'end': 587.962, 'text': 'And those are all tied into these different numbers that we have here.', 'start': 584.461, 'duration': 3.501}, {'end': 592.124, 'text': 'Of course you can pause your screen if you want to go and type all that in.', 'start': 587.982, 'duration': 4.142}, {'end': 596.105, 'text': "And now I'm going to select our clear button that we have up here.", 'start': 592.524, 'duration': 3.581}, {'end': 600.147, 'text': "And I'm going to just change the name of that to clear.", 'start': 596.785, 'duration': 3.362}, {'end': 601.068, 'text': 'That works.', 'start': 600.167, 'duration': 0.901}], 'summary': "Updating button names to improve clarity and functionality, including 10 buttons linked to specific numbers and renaming the clear button to 'clear.'", 'duration': 45.743, 'max_score': 555.325, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo555325.jpg'}, {'end': 658.431, 'src': 'embed', 'start': 627.282, 'weight': 2, 'content': [{'end': 637.486, 'text': "there's multiply and this is going to be add, and i'm hitting enter every time after i type in these and finally subtract.", 'start': 627.282, 'duration': 10.204}, {'end': 641.207, 'text': 'Well, not finally, because I still have to do the memory ones.', 'start': 638.126, 'duration': 3.081}, {'end': 642.967, 'text': "So let's go and get this one.", 'start': 641.427, 'duration': 1.54}, {'end': 647.368, 'text': 'And I can do memory mem add.', 'start': 643.727, 'duration': 3.641}, {'end': 648.528, 'text': 'That works fine.', 'start': 647.388, 'duration': 1.14}, {'end': 650.629, 'text': 'And got it selected.', 'start': 649.109, 'duration': 1.52}, {'end': 653.79, 'text': "And let's change this to mem clear.", 'start': 650.889, 'duration': 2.901}, {'end': 658.431, 'text': 'And this can just be mem get.', 'start': 653.81, 'duration': 4.621}], 'summary': 'The user is performing a sequence of arithmetic operations and memory manipulations using a command line interface.', 'duration': 31.149, 'max_score': 627.282, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo627282.jpg'}, {'end': 752.595, 'src': 'embed', 'start': 726.061, 'weight': 4, 'content': [{'end': 733.767, 'text': "Okay, so basically what we have here with this guy right here is we're saying that we want to use the standard UI namespace,", 'start': 726.061, 'duration': 7.706}, {'end': 736.028, 'text': 'which is going to be tied to our UI file.', 'start': 733.767, 'duration': 2.261}, {'end': 737.51, 'text': 'this file over here, calculator.ui.', 'start': 736.028, 'duration': 1.482}, {'end': 740.67, 'text': 'And What else we got here?', 'start': 737.57, 'duration': 3.1}, {'end': 752.595, 'text': 'We also are going to declare here with the QObject that we want to declare our class as a QObject, which is the base class for all of our Qt objects,', 'start': 740.891, 'duration': 11.704}], 'summary': 'Using standard ui namespace tied to calculator.ui file, declaring class as qobject.', 'duration': 26.534, 'max_score': 726.061, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo726061.jpg'}, {'end': 909.658, 'src': 'embed', 'start': 843.204, 'weight': 3, 'content': [{'end': 847.425, 'text': "everything we're going to be changing is going to be occurring in calculator.cpp.", 'start': 843.204, 'duration': 4.221}, {'end': 849.206, 'text': "so let's open that guy up All right.", 'start': 847.425, 'duration': 1.781}, {'end': 859.035, 'text': 'So what are we going to need inside of our calculator? Well, I would like to be able to track our current value for our calculation.', 'start': 849.226, 'duration': 9.809}, {'end': 860.897, 'text': "So I'm going to create a double inside here.", 'start': 859.055, 'duration': 1.842}, {'end': 867.262, 'text': "I'm going to call this calc value and it's going to start off with a value of 0.0.", 'start': 860.937, 'duration': 6.325}, {'end': 872.286, 'text': "I'd also like to define what was the last math button that was clicked on.", 'start': 867.262, 'duration': 5.024}, {'end': 874.787, 'text': "So I'm going to create a whole bunch of booleans here.", 'start': 872.306, 'duration': 2.481}, {'end': 878.95, 'text': "So let's go trigger and false.", 'start': 874.807, 'duration': 4.143}, {'end': 884.234, 'text': "And I'm going to have to constantly keep track of which of the math buttons has been clicked on.", 'start': 879.19, 'duration': 5.044}, {'end': 887.717, 'text': "And you'll see here in a moment why exactly that's going to work that way.", 'start': 884.694, 'duration': 3.023}, {'end': 896.666, 'text': "So I'm also going to be able to track multiplication and the addition button and the subtraction button.", 'start': 887.897, 'duration': 8.769}, {'end': 898.868, 'text': 'This is going to be really, really simple the way this works.', 'start': 896.706, 'duration': 2.162}, {'end': 900.349, 'text': 'Here is our constructor.', 'start': 899.228, 'duration': 1.121}, {'end': 902.111, 'text': "We've used that a million times before.", 'start': 900.449, 'duration': 1.662}, {'end': 904.653, 'text': 'Here is our QMainWindow constructor.', 'start': 902.331, 'duration': 2.322}, {'end': 909.658, 'text': "We've talked about it in the previous tutorial, but that's all that you really need to worry about that.", 'start': 905.354, 'duration': 4.304}], 'summary': 'In calculator.cpp, a double calc value is initialized to 0.0 and booleans are set to track math button clicks.', 'duration': 66.454, 'max_score': 843.204, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo843204.jpg'}, {'end': 952.595, 'src': 'embed', 'start': 928.013, 'weight': 6, 'content': [{'end': 934.618, 'text': "and I'm going to be doing a lot of the work right here inside of this to initialize everything right whenever we create it.", 'start': 928.013, 'duration': 6.605}, {'end': 940.083, 'text': "so let's say that i want to come in here and you can see that we're able to reference the ui just by going ui.", 'start': 935.018, 'duration': 5.065}, {'end': 945.928, 'text': 'very first thing i want to do is i want to make sure that 0.0 is showing up in our display.', 'start': 940.083, 'duration': 5.845}, {'end': 952.595, 'text': "well, to do that, i just go ui and then i put in the whatever the name is for the widget we're working with,", 'start': 945.928, 'duration': 6.667}], 'summary': 'Demonstrating how to initialize and reference ui elements for widget interaction.', 'duration': 24.582, 'max_score': 928.013, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo928013.jpg'}], 'start': 555.325, 'title': 'Ui button naming and calculator ui design', 'summary': 'Discusses renaming ui buttons and their functionality, stressing clear and consistent naming. it also covers calculator ui design, button color changes, event handling, and default display value of 0.0.', 'chapters': [{'end': 658.431, 'start': 555.325, 'title': 'Ui button naming and functionality', 'summary': 'Discusses the process of renaming and assigning functionality to various buttons on a user interface, emphasizing the importance of clear and consistent naming for easy reference in code.', 'duration': 103.106, 'highlights': ["Buttons renamed from generic labels to specific names like 'Button 7' and 'clear' for clarity and function association.", 'The significance of clear and consistent button naming is highlighted as it directly impacts code referencing and event handling setup.', "The process involves renaming various buttons, such as 'change sign', 'divide', 'multiply', 'add', 'subtract', 'mem add', 'mem clear', and 'mem get'."]}, {'end': 990.297, 'start': 658.991, 'title': 'Calculator ui design and event handling', 'summary': 'Discusses designing a calculator ui, including changing button colors, event handling for signals and slots, and initializing the display with a default value of 0.0.', 'duration': 331.306, 'highlights': ['The chapter discusses designing a calculator UI, including changing button colors, event handling for signals and slots, and initializing the display with a default value of 0.0. The chapter covers designing a calculator UI, changing button colors, event handling for signals and slots, and setting the initial display value to 0.0.', 'The UI namespace is being used, tied to the calculator.ui file, and a class is declared as a QObject to handle event handling for signals and slots. The UI namespace is utilized, tied to the calculator.ui file, and a class is declared as a QObject to manage event handling for signals and slots.', 'The constructor is defined with a parent class of QObject and the slots are also defined to handle signal execution, such as when number buttons or math buttons are pressed. The constructor is defined with a parent class of QObject, and slots are also defined to manage signal execution when number buttons or math buttons are pressed.', 'The process of initializing the display with a default value of 0.0 is explained, involving referencing the UI class and changing the text displayed using set text and converting the double to a Q string. The process of initializing the display with a default value of 0.0 is explained, involving referencing the UI class, changing the displayed text using set text, and converting the double to a Q string.', 'The need to keep track of the last math button clicked on and the creation of booleans to track different math buttons are discussed. The need to track the last math button clicked on and the use of booleans to track different math buttons are discussed.']}], 'duration': 434.972, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo555325.jpg', 'highlights': ["Buttons renamed from generic labels to specific names like 'Button 7' and 'clear' for clarity and function association.", 'The significance of clear and consistent button naming is highlighted as it directly impacts code referencing and event handling setup.', "The process involves renaming various buttons, such as 'change sign', 'divide', 'multiply', 'add', 'subtract', 'mem add', 'mem clear', and 'mem get'.", 'The chapter discusses designing a calculator UI, including changing button colors, event handling for signals and slots, and initializing the display with a default value of 0.0.', 'The UI namespace is being used, tied to the calculator.ui file, and a class is declared as a QObject to handle event handling for signals and slots.', 'The constructor is defined with a parent class of QObject and the slots are also defined to handle signal execution, such as when number buttons or math buttons are pressed.', 'The process of initializing the display with a default value of 0.0 is explained, involving referencing the UI class and changing the text displayed using set text and converting the double to a Q string.', 'The need to keep track of the last math button clicked on and the creation of booleans to track different math buttons are discussed.']}, {'end': 1448.639, 'segs': [{'end': 1016.739, 'src': 'embed', 'start': 990.337, 'weight': 0, 'content': [{'end': 996.606, 'text': "This is all I'm almost structuring this as a learn QT in one video the way that I have this set up.", 'start': 990.337, 'duration': 6.269}, {'end': 1003.33, 'text': "I'm also going to create an array that's going to hold a reference to all my Q push buttons.", 'start': 996.846, 'duration': 6.484}, {'end': 1006.873, 'text': 'So to do that, just go Q push button.', 'start': 1003.811, 'duration': 3.062}, {'end': 1011.596, 'text': "And I'm going to call it num buttons.", 'start': 1007.613, 'duration': 3.983}, {'end': 1015.539, 'text': "And how many do I need? Well, it's 0 through 9, so I need 10 of them.", 'start': 1012.136, 'duration': 3.403}, {'end': 1016.739, 'text': 'So we got that created.', 'start': 1015.719, 'duration': 1.02}], 'summary': 'Creating an array of 10 qpushbuttons for qt learning video.', 'duration': 26.402, 'max_score': 990.337, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo990337.jpg'}, {'end': 1068.113, 'src': 'embed', 'start': 1039.512, 'weight': 2, 'content': [{'end': 1057.004, 'text': "and then i'll go plus plus i and i'm going to create a q string and i'll call this But name is equal to and button and the reason I'm doing it this way is because that's what I named our buttons,", 'start': 1039.512, 'duration': 17.492}, {'end': 1057.845, 'text': 'as you see right here.', 'start': 1057.004, 'duration': 0.841}, {'end': 1059.767, 'text': 'Button zero, all the way through nine.', 'start': 1058.065, 'duration': 1.702}, {'end': 1061.168, 'text': 'Okay? Simple stuff.', 'start': 1059.787, 'duration': 1.381}, {'end': 1064.59, 'text': "Okay And you can't just put the number inside of there, though.", 'start': 1061.468, 'duration': 3.122}, {'end': 1068.113, 'text': 'You have to go and convert this to a QString.', 'start': 1064.63, 'duration': 3.483}], 'summary': "Creating a qstring named 'but name' for buttons zero to nine.", 'duration': 28.601, 'max_score': 1039.512, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo1039512.jpg'}, {'end': 1158.486, 'src': 'embed', 'start': 1095.866, 'weight': 1, 'content': [{'end': 1101.269, 'text': 'And if you want to find our calculator, calc, You later.', 'start': 1095.866, 'duration': 5.403}, {'end': 1101.969, 'text': 'There we are.', 'start': 1101.489, 'duration': 0.48}, {'end': 1107.552, 'text': 'And if you want to find a child widget inside of there, you go find child.', 'start': 1102.289, 'duration': 5.263}, {'end': 1118.637, 'text': "And I'm specifically looking, I'm going to cast this to a push button and I can put our button name inside of it.", 'start': 1108.192, 'duration': 10.445}, {'end': 1125.24, 'text': "So that's how you do a search for a specific widget, which is by providing the name.", 'start': 1118.817, 'duration': 6.423}, {'end': 1128.022, 'text': 'Okay So another thing we learned, which is good stuff.', 'start': 1125.26, 'duration': 2.762}, {'end': 1137.869, 'text': 'Now what I want to do is whenever our button is released, I want to call the function numPressed, which we defined previously in our header.', 'start': 1128.382, 'duration': 9.487}, {'end': 1142.833, 'text': "So I'm going to go connect and numButtons.", 'start': 1137.889, 'duration': 4.944}, {'end': 1158.486, 'text': 'i and I have to define signal, and this is going to be whenever one of those buttons is released, and then I am going to pass this inside of there,', 'start': 1142.833, 'duration': 15.653}], 'summary': 'Search for specific widget by name and call function when button is released.', 'duration': 62.62, 'max_score': 1095.866, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo1095866.jpg'}, {'end': 1375.544, 'src': 'embed', 'start': 1345.727, 'weight': 4, 'content': [{'end': 1351.55, 'text': 'and i can go and combine those into a new q string and double.', 'start': 1345.727, 'duration': 5.823}, {'end': 1353.391, 'text': "and let's just call this double.", 'start': 1351.55, 'duration': 1.841}, {'end': 1363.617, 'text': 'new value is equal to new value, to oops, double and convert that to a double.', 'start': 1353.391, 'duration': 10.226}, {'end': 1365.218, 'text': 'and then what else do i want to do?', 'start': 1363.617, 'duration': 1.601}, {'end': 1375.544, 'text': "basically, i need to set the value in the display and i'm also going to do set it up so that it will be able to handle a maximum of 16 digits before it uses exponents.", 'start': 1365.538, 'duration': 10.006}], 'summary': 'Combining q strings to create a new value, setting display value with a maximum of 16 digits.', 'duration': 29.817, 'max_score': 1345.727, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo1345727.jpg'}], 'start': 990.337, 'title': 'Qt array creation and signal assignment', 'summary': 'Demonstrates creating an array of q push buttons 0-9 and assigning signals using a for loop and qstring conversion. it also covers connecting button signals to the numpressed function, limiting the display to 16 digits before using exponents.', 'chapters': [{'end': 1125.24, 'start': 990.337, 'title': 'Learn qt: creating array and assigning signals', 'summary': 'Demonstrates creating an array to hold q push buttons 0 through 9 and assigning signals to each button using a for loop and qstring conversion, providing a thorough explanation of each step.', 'duration': 134.903, 'highlights': ['The chapter demonstrates creating an array to hold Q push buttons 0 through 9 and assigning signals to each button using a for loop and QString conversion.', 'A for loop is used to cycle through each button, and a QString is created to hold the button name and assign signals.', 'The chapter provides a detailed explanation of how to search for a specific widget by providing the name and casting it to a push button.']}, {'end': 1448.639, 'start': 1125.26, 'title': 'Connecting button signals', 'summary': 'Discusses connecting button signals to the numpressed function, setting up the numpressed function to handle button clicks and updating the display with the button value while limiting it to 16 digits before using exponents.', 'duration': 323.379, 'highlights': ['The chapter discusses connecting button signals to the numPressed function, which was defined previously in the header.', 'It explains setting up the numPressed function to handle button clicks by retrieving the button value and updating the display.', 'The display is set up to handle a maximum of 16 digits before using exponents.', 'The tutorial demonstrates the process of connecting button signals and defining the function to handle button clicks.']}], 'duration': 458.302, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo990337.jpg', 'highlights': ['The chapter demonstrates creating an array to hold Q push buttons 0 through 9 and assigning signals to each button using a for loop and QString conversion.', 'The chapter discusses connecting button signals to the numPressed function, which was defined previously in the header.', 'A for loop is used to cycle through each button, and a QString is created to hold the button name and assign signals.', 'It explains setting up the numPressed function to handle button clicks by retrieving the button value and updating the display.', 'The display is set up to handle a maximum of 16 digits before using exponents.', 'The chapter provides a detailed explanation of how to search for a specific widget by providing the name and casting it to a push button.', 'The tutorial demonstrates the process of connecting button signals and defining the function to handle button clicks.']}, {'end': 1939.375, 'segs': [{'end': 1529.452, 'src': 'embed', 'start': 1500.022, 'weight': 0, 'content': [{'end': 1501.322, 'text': 'And got that all set up.', 'start': 1500.022, 'duration': 1.3}, {'end': 1502.263, 'text': 'All right.', 'start': 1501.583, 'duration': 0.68}, {'end': 1504.843, 'text': 'Whoops And put this here.', 'start': 1502.343, 'duration': 2.5}, {'end': 1512.546, 'text': 'Okay So now what are we going to need to do? I want to be able to track which math button was clicked on last.', 'start': 1505.444, 'duration': 7.102}, {'end': 1513.766, 'text': "We've already covered that.", 'start': 1512.646, 'duration': 1.12}, {'end': 1517.727, 'text': 'So what I want to do here is whenever a new one is clicked on.', 'start': 1514.186, 'duration': 3.541}, {'end': 1529.452, 'text': "I want to set all of them to false again because we know that we have a new one that's pressed and we want to go verify what that is.", 'start': 1518.087, 'duration': 11.365}], 'summary': 'Setting up a system to track the last clicked math button and resetting others to false when a new one is clicked.', 'duration': 29.43, 'max_score': 1500.022, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo1500022.jpg'}, {'end': 1786.978, 'src': 'embed', 'start': 1722.09, 'weight': 1, 'content': [{'end': 1724.591, 'text': "And that's going to handle if a math button was pressed.", 'start': 1722.09, 'duration': 2.501}, {'end': 1725.512, 'text': "So that's good.", 'start': 1724.711, 'duration': 0.801}, {'end': 1727.052, 'text': "Let's jump back over here again.", 'start': 1725.552, 'duration': 1.5}, {'end': 1737.121, 'text': "And now let's handle if our equals button was clicked on and just paste that there and change this to calculator.", 'start': 1727.072, 'duration': 10.049}, {'end': 1745.513, 'text': 'Right Now, if an equals button is pressed, what I want to do is I want to hold our calculation.', 'start': 1737.621, 'duration': 7.892}, {'end': 1748.734, 'text': "Whoops, what am I doing here? I'm going to hold my calculation.", 'start': 1745.613, 'duration': 3.121}, {'end': 1754.735, 'text': "And let's just call it solution and 0.0.", 'start': 1749.474, 'duration': 5.261}, {'end': 1760.757, 'text': 'And then we can go and get the value that is in the display to perform said calculation.', 'start': 1754.735, 'duration': 6.022}, {'end': 1764.258, 'text': 'So display value is equal to UI.', 'start': 1761.337, 'duration': 2.921}, {'end': 1773.065, 'text': 'and call display and then call text, and there we go all right.', 'start': 1766.518, 'duration': 6.547}, {'end': 1776.948, 'text': "so now what i want to do is i'm going to convert that into a double.", 'start': 1773.065, 'duration': 3.883}, {'end': 1784.796, 'text': "so let's just call this double display value is equal to display value.", 'start': 1776.948, 'duration': 7.848}, {'end': 1786.978, 'text': 'convert it to a double.', 'start': 1784.796, 'duration': 2.182}], 'summary': 'Handling math button press and equals button click in a calculator app.', 'duration': 64.888, 'max_score': 1722.09, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo1722090.jpg'}], 'start': 1448.919, 'title': 'Implementing calculator functionality', 'summary': 'Covers the implementation of math button functionality, including setting up the code for tracking the math button clicked on, storing and converting the current value, and determining the math symbol on the button. additionally, it delves into the development of calculator functionality, including handling math button clicks, performing calculations based on the button clicked, and updating the display with the result.', 'chapters': [{'end': 1629.51, 'start': 1448.919, 'title': 'Implementing math button functionality', 'summary': 'Covers the implementation of math button functionality, including setting up the code for tracking the math button clicked on, storing and converting the current value, and determining the math symbol on the button.', 'duration': 180.591, 'highlights': ['The chapter covers the implementation of math button functionality, including setting up the code for tracking the math button clicked on, storing and converting the current value, and determining the math symbol on the button.', 'The code is written to track which math button was clicked on last and set all of them to false whenever a new one is clicked on.', "The chapter explains the process of storing the current value inside 'display' and converting it into a double for further calculations.", 'It covers the method to check the sender to find out what math button was actually clicked on and get the math symbol on the button.', 'The tutorial also includes a demonstration of comparing Q strings, adding to the comprehensive content of the chapter.']}, {'end': 1939.375, 'start': 1629.51, 'title': 'Calculator functionality', 'summary': 'Covers the development of calculator functionality, including handling math button clicks, performing calculations based on the button clicked, and updating the display with the result.', 'duration': 309.865, 'highlights': ['Performing calculations based on the button clicked The code includes logic to handle different math operations such as addition, subtraction, multiplication, and division, with specific actions defined for each operation.', 'Handling math button clicks The transcript outlines the process of identifying if a math button was clicked, and then triggering the corresponding action based on the specific math operation selected.', 'Updating the display with the result The code involves updating the display with the calculated result using the set text function and converting the solution into a qstring to display the numerical output.']}], 'duration': 490.456, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo1448919.jpg', 'highlights': ['The chapter covers the implementation of math button functionality, including setting up the code for tracking the math button clicked on, storing and converting the current value, and determining the math symbol on the button.', 'Performing calculations based on the button clicked The code includes logic to handle different math operations such as addition, subtraction, multiplication, and division, with specific actions defined for each operation.', 'Handling math button clicks The transcript outlines the process of identifying if a math button was clicked, and then triggering the corresponding action based on the specific math operation selected.', 'The code is written to track which math button was clicked on last and set all of them to false whenever a new one is clicked on.', "The chapter explains the process of storing the current value inside 'display' and converting it into a double for further calculations."]}, {'end': 2302.587, 'segs': [{'end': 1963.548, 'src': 'embed', 'start': 1939.755, 'weight': 0, 'content': [{'end': 1946.22, 'text': "Okay, so now I'm going to go and get the value that is currently in our display,", 'start': 1939.755, 'duration': 6.465}, {'end': 1952.786, 'text': 'to change the value from subtraction to a negative sign or a positive sign.', 'start': 1946.22, 'duration': 6.566}, {'end': 1954.346, 'text': 'for our text.', 'start': 1953.346, 'duration': 1}, {'end': 1956.387, 'text': 'Okay, so we got that.', 'start': 1954.966, 'duration': 1.421}, {'end': 1963.548, 'text': "And now I'm going to show you how to do a regular expression check to verify that what is inside of there is actually a number.", 'start': 1956.947, 'duration': 6.601}], 'summary': 'Demonstrating changing display value and using regex for number verification.', 'duration': 23.793, 'max_score': 1939.755, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo1939755.jpg'}, {'end': 2041.827, 'src': 'embed', 'start': 2009.058, 'weight': 5, 'content': [{'end': 2016.123, 'text': "So if we have a match, then I'm going to say that we can change the value on it.", 'start': 2009.058, 'duration': 7.065}, {'end': 2023.829, 'text': 'So double display value is equal to display value to double.', 'start': 2016.244, 'duration': 7.585}, {'end': 2028.172, 'text': 'And then again, double display.', 'start': 2024.269, 'duration': 3.903}, {'end': 2029.933, 'text': "You know what? Let's do that.", 'start': 2028.192, 'duration': 1.741}, {'end': 2033.476, 'text': "And then let's just change this to sign is equal to.", 'start': 2030.114, 'duration': 3.362}, {'end': 2037.219, 'text': 'And if we want to negate whatever it is, we multiply it times one.', 'start': 2033.596, 'duration': 3.623}, {'end': 2040.785, 'text': 'And double display value.', 'start': 2038.04, 'duration': 2.745}, {'end': 2041.827, 'text': 'There we go.', 'start': 2040.805, 'duration': 1.022}], 'summary': 'Changing value on a match, double display value equal to display value to double, negate by multiplying by one.', 'duration': 32.769, 'max_score': 2009.058, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo2009058.jpg'}, {'end': 2099.999, 'src': 'embed', 'start': 2070.449, 'weight': 3, 'content': [{'end': 2073.13, 'text': "And that's our whole calculator, guys, I think, as long as I did it right.", 'start': 2070.449, 'duration': 2.681}, {'end': 2073.731, 'text': "So let's run it.", 'start': 2073.15, 'duration': 0.581}, {'end': 2075.212, 'text': 'And here is our calculator.', 'start': 2074.031, 'duration': 1.181}, {'end': 2080.974, 'text': 'And we can do something like 2 plus 3, or 23, I guess.', 'start': 2075.592, 'duration': 5.382}, {'end': 2083.495, 'text': "Whoops You know what? Let's run it again.", 'start': 2081.054, 'duration': 2.441}, {'end': 2085.176, 'text': "Well, let's just do 23.", 'start': 2083.635, 'duration': 1.541}, {'end': 2087.536, 'text': "And then we'll do plus 3.", 'start': 2085.176, 'duration': 2.36}, {'end': 2089.437, 'text': 'Whoops I made some type of an error here.', 'start': 2087.536, 'duration': 1.901}, {'end': 2091.197, 'text': "Let's go and figure out what I did.", 'start': 2089.578, 'duration': 1.619}, {'end': 2092.119, 'text': 'Oh, I know.', 'start': 2091.638, 'duration': 0.481}, {'end': 2093.199, 'text': "I'm a meathead sometimes.", 'start': 2092.159, 'duration': 1.04}, {'end': 2099.999, 'text': 'I forgot to tie our different signals with our slots.', 'start': 2093.59, 'duration': 6.409}], 'summary': 'A calculator program was developed, but encountered errors during testing.', 'duration': 29.55, 'max_score': 2070.449, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo2070449.jpg'}, {'end': 2228.935, 'src': 'embed', 'start': 2199.112, 'weight': 1, 'content': [{'end': 2205.016, 'text': 'see what we defined these slots down here are these functions, and then the names come from here.', 'start': 2199.112, 'duration': 5.904}, {'end': 2208.819, 'text': 'so see change sign and all the other different things.', 'start': 2205.016, 'duration': 3.803}, {'end': 2211.761, 'text': "all right, let's run it, make sure it's all saved.", 'start': 2208.819, 'duration': 2.942}, {'end': 2215.644, 'text': 'equal button pressed.', 'start': 2214.123, 'duration': 1.521}, {'end': 2217.626, 'text': 'so what did i do wrong there?', 'start': 2215.644, 'duration': 1.982}, {'end': 2219.988, 'text': "let's go and verify that.", 'start': 2217.626, 'duration': 2.362}, {'end': 2228.395, 'text': 'so back into this and back into calculator, sometimes i make mistakes because i make mistakes.', 'start': 2219.988, 'duration': 8.407}, {'end': 2228.935, 'text': 'all right.', 'start': 2228.395, 'duration': 0.54}], 'summary': 'Defining slots and functions, testing and verifying the calculator app.', 'duration': 29.823, 'max_score': 2199.112, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo2199112.jpg'}, {'end': 2282.474, 'src': 'embed', 'start': 2251.881, 'weight': 2, 'content': [{'end': 2254.504, 'text': "Doesn't that make more sense to have it be that? I think so.", 'start': 2251.881, 'duration': 2.623}, {'end': 2255.976, 'text': "And let's run it again.", 'start': 2254.915, 'duration': 1.061}, {'end': 2258.377, 'text': 'And hopefully I got everything sorted out there.', 'start': 2256.096, 'duration': 2.281}, {'end': 2259.778, 'text': 'And it looks like I did.', 'start': 2258.818, 'duration': 0.96}, {'end': 2261.039, 'text': 'There are no errors.', 'start': 2259.838, 'duration': 1.201}, {'end': 2262.26, 'text': "And let's do it again.", 'start': 2261.46, 'duration': 0.8}, {'end': 2265.062, 'text': 'So we will go 3 minus 2 is equal to 1.', 'start': 2262.44, 'duration': 2.622}, {'end': 2265.522, 'text': 'Good stuff.', 'start': 2265.062, 'duration': 0.46}, {'end': 2268.584, 'text': 'And then we can say plus 3 is equal to 4, which is also good.', 'start': 2265.542, 'duration': 3.042}, {'end': 2282.474, 'text': 'times two is equal to eight, divided by four is equal to two, and then we can also change.', 'start': 2273.988, 'duration': 8.486}], 'summary': 'Successful execution of multiple calculations without any errors, including 3-2=1, 3+3=6, 6*2=12, 12/4=3.', 'duration': 30.593, 'max_score': 2251.881, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo2251881.jpg'}], 'start': 1939.755, 'title': 'Calculator display and slot connection', 'summary': 'Demonstrates using regular expressions to validate and manipulate input for a calculator display, ensuring it accepts various number formats, and details the process of connecting signals with slots for arithmetic operations in the calculator code.', 'chapters': [{'end': 2093.199, 'start': 1939.755, 'title': 'Regular expression for calculator display', 'summary': 'Demonstrates how to use regular expressions to validate and manipulate input for a calculator display, ensuring it accepts numbers with optional positive/negative signs and decimals, and showcases the process of converting the input to a double and displaying the result.', 'duration': 153.444, 'highlights': ['The chapter illustrates the process of using regular expressions to validate the input for a calculator display, allowing for numbers with optional positive/negative signs and decimals, ensuring accurate input handling.', 'It also showcases the steps for converting the validated input to a double and displaying the result on the calculator interface, providing a practical demonstration of the input manipulation process.', 'Additionally, the demonstration includes error identification and resolution, highlighting common mistakes and the debugging process in software development.']}, {'end': 2302.587, 'start': 2093.59, 'title': 'Slot connection in calculator code', 'summary': 'Details the process of connecting different signals with slots in a calculator code, ensuring the functionality of arithmetic operations such as addition, subtraction, multiplication, and division, and demonstrates the successful execution of these operations in the program.', 'duration': 208.997, 'highlights': ['The chapter details the process of connecting different signals with slots in a calculator code The transcript emphasizes the importance of connecting different signals with slots in the calculator code to ensure the functionality of various arithmetic operations.', 'Demonstrates the successful execution of arithmetic operations in the program The transcript provides examples of successful arithmetic operations, including addition, subtraction, multiplication, division, and sign changes, demonstrating the effective working of the program.', 'Emphasis on ensuring the functionality of arithmetic operations such as addition, subtraction, multiplication, and division The chapter focuses on the meticulous process of ensuring the proper functionality of arithmetic operations such as addition, subtraction, multiplication, and division within the calculator code.']}], 'duration': 362.832, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/txGRU7OrTZo/pics/txGRU7OrTZo1939755.jpg', 'highlights': ['The chapter illustrates the process of using regular expressions to validate the input for a calculator display, allowing for numbers with optional positive/negative signs and decimals, ensuring accurate input handling.', 'The chapter details the process of connecting different signals with slots in a calculator code, emphasizing the importance of ensuring the functionality of various arithmetic operations.', 'The demonstration includes error identification and resolution, highlighting common mistakes and the debugging process in software development.', 'Demonstrates the successful execution of arithmetic operations in the program, providing examples of addition, subtraction, multiplication, division, and sign changes.', 'The chapter focuses on the meticulous process of ensuring the proper functionality of arithmetic operations such as addition, subtraction, multiplication, and division within the calculator code.', 'It also showcases the steps for converting the validated input to a double and displaying the result on the calculator interface, providing a practical demonstration of the input manipulation process.']}], 'highlights': ['The tutorial covers creating a complete GUI calculator, including interfaces, style sheets, slots, signals, and widgets.', 'The chapter demonstrates setting up a grid layout for the calculator interface, providing a structured layout for the components.', "Buttons renamed from generic labels to specific names like 'Button 7' and 'clear' for clarity and function association.", 'The chapter demonstrates creating an array to hold Q push buttons 0 through 9 and assigning signals to each button using a for loop and QString conversion.', 'The chapter covers the implementation of math button functionality, including setting up the code for tracking the math button clicked on, storing and converting the current value, and determining the math symbol on the button.', 'The chapter illustrates the process of using regular expressions to validate the input for a calculator display, allowing for numbers with optional positive/negative signs and decimals, ensuring accurate input handling.']}