qt creator : 没有这样的文件或目录

Question

hi i'm just trying to compile an easy project in qt

#include <QApplication>

#include <QPushButton>

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

QPushButton bouton("Salut les Zéros, la forme ?");
bouton.show();

return app.exec();
}

but i have this error : /home/eid/test/easyprojet/main.cpp:1: error: QApplication: No such file or directory

can anyone help me ?

sorry for my english

Answer 1

In Qt5, it resides in , while in Qt4 it was .

In Qt5 you need to add QT += widgets to your .pro file.

Answer 2

It may be also because the project is not in the workspace of QT creator. It happened with me before. so,try to put the project in the workspace .