static void callback( GtkWidget *widget, gpointer data ){
g_print ("Hello again - %s was pressed\n", (gchar *) data);
}
why do they put () around gchar ?
why can it not be gchar *data ?
What does %s do ?
Are gpointer and gchar global variables of gtk ?
Are gpointer and gchar data types or objects ?
What does gpointer and gchar represent ?
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