Compilare: user.c: In function ‘G’: user.c:22:5: warning: implicit declaration of function ‘isdigit’ [-Wimplicit-function-declaration] while(!isdigit(c)) ^ user.c: In function ‘main’: user.c:34:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("momente.in","r",stdin); ^ user.c:35:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("momente.out","w",stdout); ^ user.c:52:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.c:65:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d%d%d%d%d",&l1,&d1,&h1,&m1,&s1,&l2,&d2,&h2,&m2,&s2); ^