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I am new to Qt and am have to make a GUI having multiple windows for this I found QStackedWidget class using Qt designer tools.

I added QStackedWidget using add new->Qt designer form class->Qstackwidget

after that I created an object of this class in my main window

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include<stackedwidget.h>
namespace Ui { class MainWindow; }
class MainWindow : public QMainWindow {
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
private slots:
    void on_pushButton_clicked();
private:
    Ui::MainWindow *ui;
    StackedWidget *stk; };
#endif // MAINWINDOW_H
then i tried to display StackedWidget by:
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
    ui->setupUi(this);
MainWindow::~MainWindow()
    delete ui;
void MainWindow::on_pushButton_clicked()
    stk = new StackedWidget(this);
    stk->show();
But stackwidget is not opening .
Can someone tell me what am I doing wrong and how to implement QStackedWidget GUI using designer tools?
                Change stk = new StackedWidget(this); stk->show(); to stk = new StackedWidget(this);  centralWidget()->layout()->addWidget(stk);
– eyllanesc
                Aug 17, 2017 at 5:21
                i want to add multiple pages in it but right now i am not even able to understand how to display it
– vasu gupta
                Aug 17, 2017 at 5:23
                First you have to add the QStackedWidget to your MainWindow, with the code that shows what you are doing, then add the other widgets to your QStackedWidget.
– eyllanesc
                Aug 17, 2017 at 5:25
The QStackedWidget class provides a stack of widgets where only one widget is visible at a time.
You are new to Qt so I suggest you to using Qt Designer: 
You can drag&drop StackedWidget to your form, customize it then use arrows to go to the next page and work on it too.
StackedWidget is like a vector you can access them via indexes.
ui->stackedWidget->setCurrentIndex(1);
        
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