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 | #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
 
 
/*VARIABLES D'ENVIRONNEMENT*/
GtkWidget * p_win    = NULL;
GtkWidget * p_vbox   = NULL;
GtkWidget * p_entry [3];
GtkWidget * p_label [3];
GtkWidget * p_button [1];
const gchar *sText;
 
 
typedef struct
{
 
   double op1;
   double op2;
   double resultat;
 
 
}
operandes;
 
 
void cb_activate (GtkEntry * p_wid, gpointer p_data)
{
   GtkEntry * p_entry = (GtkEntry *) p_data;
 
   g_return_if_fail (p_wid != NULL);
   g_return_if_fail (p_data != NULL);
 
   gtk_widget_grab_focus (GTK_WIDGET (p_entry));
}
 
 
void cb_clicked (GtkButton * p_wid, gpointer p_data)
{
   char buff [20];
   operandes * op = NULL;
 
   g_return_if_fail (p_wid != NULL);
   g_return_if_fail (p_data != NULL);
 
   op = (operandes *) p_data;
   op->op1 = strtod (gtk_entry_get_text (GTK_ENTRY (p_entry[0])), NULL);
   op->op2 = strtod (gtk_entry_get_text (GTK_ENTRY (p_entry[1])), NULL);
   op->resultat = op->op1 + op->op2;
 
 
   /*RETRAIT DU BUFFER
 
   sprintf (buff, "%.3f", op->resultat);
   buff [strlen (buff) - 1] = '\0';
   
   gtk_entry_set_text (GTK_ENTRY (p_entry[2]), buff);*/
 
 
 
 /*Recuperation du texte contenu dans le GtkEntry */
    sText = gtk_entry_get_text(GTK_ENTRY(p_entry[1]));
    gtk_entry_set_text(GTK_ENTRY(p_entry[2]), sText);
}
 
 
int main (int argc, char ** argv)
{
   /*VARIABLES DE CALCUL*/
   operandes op;
 
 
   gtk_init (& argc, & argv);
 
 
   p_win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   gtk_window_set_title (GTK_WINDOW (p_win), "GtkEntry...");
   gtk_container_set_border_width (GTK_CONTAINER (p_win), 5);
 
   g_signal_connect (
      G_OBJECT (p_win), "destroy",
      G_CALLBACK (gtk_main_quit), NULL
   );
 
 
   p_vbox = gtk_vbox_new (FALSE, 5);
   gtk_container_add (GTK_CONTAINER (p_win), p_vbox);
 
 
   /*MISE EN PLACE DES ELEMENTS DE LA FENETRE*/
 
   p_entry[0] = gtk_entry_new ();
   p_entry[1] = gtk_entry_new ();
   p_entry[2] = gtk_entry_new ();
   p_label[0] = gtk_label_new("TAPEZ VOTRE 1er NOMBRE ");
   p_label[1]  = gtk_label_new("TAPEZ VOTRE 2eme NOMBRE ");
   p_label[2] = gtk_label_new("RESULTAT DE L'ADDITION =");
   p_button[0] = gtk_button_new_with_label("VALIDATION");
p_label[2] = gtk_label_new("");
 
 
 
 
 
 
   gtk_entry_set_alignment (GTK_ENTRY (p_entry[0]), 1); 
   gtk_entry_set_alignment (GTK_ENTRY (p_entry[1]), 1);
   gtk_entry_set_alignment (GTK_ENTRY (p_entry[2]), 1);
 
   gtk_box_pack_start(GTK_BOX(p_vbox), p_label[0], TRUE, FALSE, 0);
   gtk_box_pack_start (GTK_BOX (p_vbox), p_entry[0], TRUE, TRUE, 5);
   gtk_box_pack_start(GTK_BOX(p_vbox), p_label[1], TRUE, FALSE, 0);
   gtk_box_pack_start (GTK_BOX (p_vbox), p_entry[1], TRUE, TRUE, 5);
   gtk_box_pack_start(GTK_BOX(p_vbox), p_button[0], TRUE, TRUE, 0);
   gtk_box_pack_start(GTK_BOX(p_vbox), p_label[3], TRUE, TRUE, 5);
   gtk_box_pack_start (GTK_BOX (p_vbox), p_entry[2], TRUE, TRUE, 5);
 
 
 
 
 
 
   g_signal_connect (
      G_OBJECT (p_button[0]), "clicked",
      G_CALLBACK (cb_clicked), (void *) &op
   );
 
   g_signal_connect (
      G_OBJECT (p_entry[0]), "activate",
      G_CALLBACK (cb_activate), (GtkEntry *) p_entry[1]
   );
 
 
   gtk_widget_show_all (p_win);
   gtk_main ();
 
 
   return 0;
} | 
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