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#include <gtk/gtk.h>
#include <stdio.h>
#include <stdlib.h>

GtkWidget* Window;
GtkWidget* Button;
GtkWidget* Dialog;

static void ExibirUmaVerdade();

int main(int argc, char *argv[])
{
    gtk_init(&argc, &argv);
    
    Window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    Button = gtk_button_new_with_label("Mostrar uma verdade");
    Dialog = gtk_message_dialog_new(
        NULL, GTK_DIALOG_MODAL, GTK_MESSAGE_INFO, GTK_BUTTONS_OK, "Nada é melhor do que C!"
    );
    
    gtk_widget_show_all(Window);
    gtk_widget_show_all(Button);
    gtk_container_add(GTK_CONTAINER(Window), Button);
    g_signal_connect(G_OBJECT(Button), "clicked", G_CALLBACK(ExibirUmaVerdade), NULL);
    
    gtk_main();
    
    return 0;
}

static void ExibirUmaVerdade()
{
    gtk_dialog_run(GTK_DIALOG(Dialog));
    gtk_widget_destroy(Dialog);
}