#include #include #include "fact.h" static void message_usage(char *nom_de_la_commande) { fprintf(stderr, "Usage: %s n\n", nom_de_la_commande); } int main(int argc, char *argv[]) { if (argc != 2) { message_usage(argv[0]); return EXIT_FAILURE; } else { printf("%d\n", fact(atoi(argv[1]))); return EXIT_SUCCESS; } }