Compilare: user.c: In function ‘main’: user.c:33:5: warning: format ‘%lu’ expects argument of type ‘long unsigned int *’, but argument 2 has type ‘Int *’ [-Wformat=] scanf("%lu", &n); ^ user.c:34:5: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘Int’ [-Wformat=] printf("%lu\n", ciur(n)); ^ user.c:30:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN, "r", stdin); ^ user.c:31:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT, "w", stdout); ^ user.c:33:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lu", &n); ^