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#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "mypaint.h"

namespace Ui {
    class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
     MainWindow(QWidget *parent = 0);
    ~MainWindow();
    int i;

    myPaint *wgt;

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

#ifndef MYPAINT_H
#define MYPAINT_H

#include <QWidget>

class myPaint : public QWidget
{
    Q_OBJECT
public:
    myPaint(QWidget *parent = 0);

};

#endif // MYPAINT_H

MainWindow *wind

include "MainWindow"