I'm unable to compile my first programme it says "/usr/local/qt4/include/QtCore/qstring.h:54:20: fatal error: string: No such file or directory"

aditya.rajan1

Hello i'm new to qt i'm just rying to compile an example code but it show error here is my code @#include <QtGui/QApplication>
#include <QtGui/QWidget>

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

QWidget window;

window.resize(250, 150);
window.setWindowTitle("Simple example");
window.show();

return app.exec();

}@ HERE IS THE ERROR @In file included from /usr/local/qt4/include/QtCore/qobject.h:48:0,
from /usr/local/qt4/include/QtCore/qcoreapplication.h:45,
from /usr/local/qt4/include/QtGui/qapplication.h:45,
from /usr/local/qt4/include/QtGui/QApplication:1,
from n_0.c:1:
/usr/local/qt4/include/QtCore/qstring.h:54:20: fatal error: string: No such file or directory

include <string>

compilation terminated.
make: *** [n_0.o] Error 1
@ THIS ERROR IS QUITE BIG BUT I PASTED only the essential part needed to solve my problem here

SherifOmran

add
@
#include <QString>

@

mranger90

I suspect the problem is in your environment.
I tested this with Qt 4.84, msvc 10, on Win7. and it compiled
and ran as expected.

Here is my .pro file
@
QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = test
TEMPLATE = app

SOURCES += main.cpp
@

JKSH

Hi, and welcome to the Qt Dev Net!

The Qt header <qstring.h> tries to include the standard C++ header <string>. The error messages show that your compiler could not find <string>.

You need to install the standard C++ development files in your system.

If you need more help, please tell us:

What distro are you using?

How did you install your compiler?

aditya.rajan1

thanks a lot fellas ! problem solved , actually my source file was having .c extension i changed it to .cpp and it worked !