hello-gtk.c

#include <gtk/gtk.h>

int main (int argc, char **argv)
{
  gtk_init (&argc, &argv);
  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Hello");
  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
  GtkWidget *vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
  gtk_container_add (GTK_CONTAINER (window), vbox);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 10);
  GtkWidget *label = gtk_label_new ("Hello, world!");
  gtk_container_add (GTK_CONTAINER (vbox), label);
  GtkWidget *button = gtk_button_new_with_label ("Quit");
  g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
  gtk_container_add (GTK_CONTAINER (vbox), button);
  gtk_widget_show (button);
  gtk_widget_show (label);
  gtk_widget_show (vbox);
  gtk_widget_show (window);
  gtk_main ();
  return 0;
}