Create multi UI screen application using C++ and navigate through it using PushButton

[sask1236]

Hello All,
I want to create multi UI screen application using C++ and navigate through it using PushButtons.
Suppose on every screen there are many other objects and Next and Previous PushButtons. When I press the button the respective screen must appear and previous screen must get closed. I have gone through net and found that using QStackWidget this is possible and easy, like:

QWidget *firstPageWidget = new QWidget;
QWidget *secondPageWidget = new QWidget;
QWidget *thirdPageWidget = new QWidget;
 
QStackedWidget *stackedWidget = new QStackedWidget;
stackedWidget->addWidget(firstPageWidget);
stackedWidget->addWidget(secondPageWidget);
stackedWidget->addWidget(thirdPageWidget);

QWidget *firstPageWidget = new QWidget;
QWidget *secondPageWidget = new QWidget;
QWidget *thirdPageWidget = new QWidget;

QStackedWidget *stackedWidget = new QStackedWidget;
stackedWidget->addWidget(firstPageWidget);
stackedWidget->addWidget(secondPageWidget);
stackedWidget->addWidget(thirdPageWidget);

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With setCurrentIndex ( int index )

Problem:
I am not getting how to use it, suppose I have 2 UI’s 1. MainWindow.UI and 2. MainWindow2.UI. So how to fit my MainWindow.UI and MainWindow2.UI there.

Can someone please share a simple working project for the same. I am new to QT and so not able to construct from help available on net.

Thanks in Advance
Sahil Kulkarni.