程式語言 - Qt - v6.0 - Hello, world!

參考資訊：
https://openhome.cc/Gossip/Qt4Gossip/FirstQt.html
https://stackoverflow.com/questions/8995399/error-qapplication-no-such-file-or-directory

main.cpp

#include <QApplication>
#include <QMainWindow>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow win;

    win.setWindowTitle("Hello, world!");
    win.show();
    return a.exec();
}

編譯、執行

$ cd
$ mkdir main
$ cd main
$ cp xxx/main.cpp .

$ qmake6 -project
$ echo "QT += widgets" >> main.pro
$ qmake6
$ make
$ ./main