Graphics view problem

[MKSPulok]

Why my this code is not running properly

i've the following main.cpp
@#include <QtGui/QApplication>
#include "MainWindow.h"
#include "EERTView.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
EERTView widget;
// MainWindow w;

widget.show();

return a.exec();

}@

the MainWindow.cpp

@#include "MainWindow.h"
#include "ui_MainWindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->setWindowTitle("EERTInstructor");

}

MainWindow::~MainWindow()
{
delete ui;
}
@

MainWindow.h

@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
//#include <QGraphicsView>
//#include <QGraphicsScene>
//#include <QGraphicsItem>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

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

private:
Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H
@

EERTView.cpp

@#include "EERTView.h"

EERTView::EERTView(QObject *parent) :
QGraphicsView(parent)
{
// making a scene on the application
// QGraphicsScene scene;
QGraphicsScene *scene = new QGraphicsScene(this);

   //adding some text to the scene
   scene.addText("Hello, world!", QFont("Times", 20, QFont::Bold));
   scene->set.addText("Hello, world!", QFont("Times", 20, QFont::Bold));
   //assigning that scene to the view
   QGraphicsView view(&scene);
   setScene(view);

}
@

and EERTView.h

@#ifndef EERTVIEW_H
#define EERTVIEW_H

#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsItem>

class EERTView : public QGraphicsView
{
Q_OBJECT
public:
explicit EERTView(QObject *parent = 0);

signals:

public slots:

};

#endif // EERTVIEW_H@

I'm new in Qt plz anyone help .Inform me what do do with that code and how to make that working
It give me the erro
1.call of overloaded 'QGraphicsView(QObject *&)' is ambigous

[giesbert]

Hi,

there are some errors:

@
EERTView::EERTView(QObject *parent) :
QGraphicsView(parent)
{
// making a scene on the application
// QGraphicsScene scene;
QGraphicsScene *scene = new QGraphicsScene(this);

   //adding some text to the scene
   scene.addText("Hello, world!", QFont("Times", 20, QFont::Bold));       // <-- error 1
   scene->set.addText("Hello, world!", QFont("Times", 20, QFont::Bold));// <-- error 3
   //assigning that scene to the view
   QGraphicsView view(&scene);              // <-- error 2
   setScene(view);

}
@

error 1 is that you call a not existing object

error 2 is that you create an object on the stack, add it as widget to the parent. After exiting the function, the object is destroyed again.

error 3: What is this set in the call?