//here is the very simple example for qt programming

//how to run the code,

//first copy the code and save as hello.cpp or whatever name that you prefer

//in the same directory,

//===============================

//how to compile hello.cpp

//type: qmake -projrect

//type: qmake

//then type: make

//================================

#include <QApplication>
#include <QPushButton>

int main(int argc, char *argv[])
{

QApplication app(argc, argv);
QPushButton hello(“Hello World”);
hello.click();
hello.show();

return app.exec();
}