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CppQtHelloWorldConsole.md

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(C++) Qt Hello World program (console)

 

To create a 'Hello World' (console) program in Qt Creator, you can follow the steps below:

 

  1. Start Qt Creator.

  2. If you are not shown the welcome screen, click on 'Welcome' on the left

  3. If, in the welcome screen, the 'Develop' tab is not shown, click on 'Develop' to view the Welcome screen Develop tab

  4. In the Welcome screen Develop tab, click 'Create New Project' to go to the New project dialog

  5. In the New project dialog, click 'QT4 Console Application' to go to the introduction and project location dialog.

  6. In the Introduction and project location dialog, you must specify a name and location to save your (project) files. For example, after 'Name' type 'HelloWorld'. Click next

  7. In the select required modules dialog', all checks are correct (only QtCore is checked), so click 'Next'

  8. In the project management dialog, click 'Finish'

  9. Now your project is set up. On the left menu bar, you can see you are now in 'Edit' mode (instead of 'Welcome' mode). You can see your project right of this menu bar. You can see a 'HelloWorld' project folder, containing 'HelloWorld.pro' and a folder called 'Sources'. Click on this 'Sources' folder. The source file 'main.cpp' is shown, double-click it. Note: under Xubuntu, there is no folder created called 'Sources', just double-click on 'main.cpp' directly

  10. Now you are taken to the source code of 'main.cpp':

    #include <QtCore/QCoreApplication> int main(int argc, char *argv[]) {   QCoreApplication a(argc, argv);   return a.exec(); }

  11. Replace this code by the following:

    #include <iostream> int main() {   std::cout << "Hello world\n";   std::cin.get(); }

  12. Press 'Run' on the left menu bar (or use CTRL-R) to run your application. If a 'Save Changes' dialog is shown, you might want to check 'Always save files before build' and click on 'Save All'

  13. The program is build and run. Under Microsoft Windows, a console window appears and shows the text 'Hello world' and waits for a key press to terminate. Under Xubuntu, the text is shown in a panel called 'Application output' (if you want this text to be shown in a terminal, click on the left menu bar item 'Projects', then click the tab 'Run settings' and check 'Run in terminal'.

 

If the console window is not shown, G++ is probably not installed. You can check it if you click on the warning traingle on the left menu bar. The 'Compile output' is shown, probably with the text 'make: g++: Command not found' in red. The solution is to install G++.