My first Qt Project!

mainwindow.cpp

@@ -0,0 +1,30 @@
+#include "mainwindow.h"
+#include "./ui_mainwindow.h"
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+
+    hello();
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
+void MainWindow::hello()
+{
+    auto btn = new QPushButton(this);
+
+    btn->setText("Exit");
+
+    btn->connect(btn, &QPushButton::clicked, this, &MainWindow::Exit);
+}
+
+void MainWindow::Exit()
+{
+    exit(0);
+}