void num3_clicked(GtkButton*w, GtkEntry *entry){
if(sign){
gtk_entry_set_text(entry, "");
}
GtkEntryBuffer *buffer = gtk_entry_get_buffer(entry);
gtk_entry_buffer_insert_text (buffer, -1,"3", 1);
gtk_entry_set_buffer(entry, buffer);
sign = 0;
}
/**
* gtk_entry_buffer_set_text:
* @buffer: a #GtkEntryBuffer
* @chars: the new text
* @n_chars: the number of characters in @text, or -1
*
* Sets the text in the buffer.
*
* This is roughly equivalent to calling gtk_entry_buffer_delete_text()
* and gtk_entry_buffer_insert_text().
*
* Note that @n_chars is in characters, not in bytes.
*
* Since: 2.18
**/
void
gtk_entry_buffer_set_text (GtkEntryBuffer *buffer,
const gchar *chars,
gint n_chars)
{
g_return_if_fail (GTK_IS_ENTRY_BUFFER (buffer));
g_return_if_fail (chars != NULL);
g_object_freeze_notify (G_OBJECT (buffer));
gtk_entry_buffer_delete_text (buffer, 0, -1);
gtk_entry_buffer_insert_text (buffer, 0, chars, n_chars);
g_object_thaw_notify (G_OBJECT (buffer));
}