hello.cpp

一大堆的qt程序,在qte2.3.7下全部可以很好地运行

#include <qapplication.h>
#include <qlabel.h>
#include <qbuttongroup.h>
#include <qpushbutton.h>

int main( int argc, char **argv)
{
     int width=40,height=30,space=30;
     QApplication app( argc, argv);
     QButtonGroup box;
     box.setGeometry(0,20,240,100);
     QLabel label("hello,world!",0);
//     QLabel *label = new QLabel("Hello,world!",0);
     label.setAlignment(Qt::AlignVCenter |Qt:: AlignHCenter);
     label.setGeometry(60,30,120,30);
     label.hide();
     QPushButton button1("h&ide",&box);
     button1.setGeometry((240-5*space)/3+2*space,60,width,height);
 
     QPushButton button0("&show",&box);
     button0.setGeometry(space,60,width,height);

     QPushButton button2("e&xit",&box);
     button2.setGeometry((240-5*space)*2/3+3*space,60,width,height);

     app.connect(&button0,SIGNAL(pressed()),&label,SLOT(show()));
     app.connect(&button1,SIGNAL(clicked()),&label,SLOT(hide()));
     app.connect(&button2,SIGNAL(released()),&app,SLOT(quit()));

     app.setMainWidget(&box);
     box.show();

     return app.exec();
}