change label text on button press

src/MyWindow.cc

@@ -8,17 +8,19 @@ MyWindow::MyWindow(QWidget * parent)
 {
     QHBoxLayout * layout = new QHBoxLayout();
 
-    QPushButton * button = new QPushButton("Press me");
-    layout->addWidget(button);
+    m_button = new QPushButton("Press me");
+    layout->addWidget(m_button);
 
-    QLabel * label = new QLabel("Label");
-    layout->addWidget(label);
+    m_label = new QLabel("Label");
+    layout->addWidget(m_label);
 
     setLayout(layout);
     setWindowTitle("My Qt Application!");
+
+    connect(m_button, SIGNAL(clicked()), this, SLOT(handleButton()));
 }
 
 void MyWindow::handleButton()
 {
-    cerr << "got a button press" << endl;
+    m_label->setText("The button was pressed");
 }

src/MyWindow.h

@@ -14,6 +14,10 @@ public:
 
 private slots:
     void handleButton();
+
+private:
+    QPushButton * m_button;
+    QLabel * m_label;
 };
 
 #endif