Eroare de compilare: user.c:2:1: error: unknown type name ‘using’ using namespace std; ^ user.c:2:17: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘std’ using namespace std; ^ user.c: In function ‘main’: user.c:12:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.in","r",stdin); ^ user.c:13:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.out","w",stdout); ^ user.c:15:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^