Hello
The following code will not run? Why?
Please correct.
thanks.
Qt Code: 
  1. #ifndef E_H
  2. #define E_H
  3. #include <QWidget>
  4. #include <QPaintEvent>
  5. class window:public QWidget
  6. {public:
  7.     window(QWidget* parent=0);
  8.  
  9. };
  10. #endif // E_H
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Qt Code: 
  1. #include <QtWidgets>
  2. #include "window.h"
  3. window::window(QWidget *parent): QWidget(parent)
  4. {
  5.  resize(200, 200);
  6. setWindowTitle("Window");
  7. }
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Qt Code: 
  1. #include <QWidget>
  2. #include "window.h"
  3. int main(int argc, char *argv[])
  4. {
  5.     QApplication app(argc, argv);
  6.     window win;
  7.     win.show();
  8.     return app.exec();
  9. }
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Qt Code: 
  1. QT=widgets
  2. SOURCES += \
  3.     main.cpp \
  4.     window.cpp
  5.  
  6. HEADERS += \
  7.     window.h
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Untitled1.jpg