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#include <QtGui/QApplication>

#include "widget.h"
#include "widget2.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    Widget w;
    Widget2 w2;

    w.show();
    w2.show();

    QObject::connect(w.pb,SIGNAL(clicked()),&w2,SLOT(close()));
    QObject::connect(w2.pb1,SIGNAL(clicked()),&w,SLOT(close()));

    return a.exec();
}

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    QHBoxLayout* hbl = new QHBoxLayout(this);
    pb = new QPushButton("PushButton1");

    hbl->addWidget(pb);
    setLayout(hbl);
    setFixedSize(150,100);
}

Widget::~Widget()
{
    delete ui;
}

#include "widget2.h"

Widget2::Widget2(QWidget *parent) :
    QWidget(parent)
{
    QHBoxLayout* hbl = new QHBoxLayout(this);
    pb1 = new QPushButton("PushButton2");

    hbl->addWidget(pb1);
    setLayout(hbl);

    setFixedSize(150,100);
}

Widget2::~Widget2()
{

}

#include "widget.h"
#include "widget2.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget *w = new Widget;
    Widget2 *w2 = new Widget2;

    w->show();
    
    return a.exec();
}

#include "widget2.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::on_pushButton_clicked()
{
    w2->show();
}

void MainWindow::on_pushButton_clicked()
{
    Widget2 *w2 = new Widget2;
    w2->show();
}

Widget *w = new Widget;
Widget2 *w2 = new Widget2;
QObject::connect(&w, SIGNAL(showW2()),&w2, SLOT(show()));