Compilare: user.cpp: In function ‘int main()’: user.cpp:10:4: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (a<b) if ((b-a)%x==0) y=x; ^ user.cpp:18:4: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (a>b) if ((a-b)%x==0) y=x; ^ user.cpp:6:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("holiday.in","r",stdin); ^ user.cpp:7:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("holiday.out","w",stdout); ^ user.cpp:8:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld%ld",&a,&b,&x); ^