Compilare: user.c: In function ‘main’: user.c:15:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("classictask.in", "r", stdin); ^ user.c:16:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("classictask.out", "w", stdout); ^ user.c:19:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld %lld", &a, &b, &c); ^ user.c:7:15: warning: ‘rezultat’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (b % 2==1) aux=(aux+a) % c; ^ user.c:18:25: note: ‘rezultat’ was declared here long long a, b, c, rezultat; ^