我编译hello程序总是提示错误是怎么回事啊?
#include <qapplication.h>
#include <qlabel.h>
int main(int argc,char *argv[])
{
qapplication app(argc,argv);
QLabel hello("Hello world");
hello.show();
return app.exec();
return 0;
}
编译时提示:qapplication was not declared in this scope 菜鸟级别的问题,但是不知道怎么解决