#include<gtk/gtk.h>

static void activate(GtkApplication *app,gpointer user_data){
    GtkWidget *window;
    window=gtk_application_window_new(app);
    gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER);
    gtk_window_set_title(GTK_WINDOW(window),"gtk3 test");
    gtk_widget_show_all(window);
}

int main(int argc,char *argv[]){
    GtkApplication *app;
    int status;
    app=gtk_application_new("org.gtk.example",G_APPLICATION_FLAGS_NONE);
    g_signal_connect(app,"activate",G_CALLBACK(activate),NULL);
    status=g_application_run(G_APPLICATION(app),argc,argv);
    g_object_unref(app);
    return status;
}