Compilare: user.cpp: In function ‘int cmmdc(long long int, long long int)’: user.cpp:7:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a > b) if(a % b == 0) return b; ^ user.cpp:9:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(b >= a) if(b % a == 0) return a; ^ user.cpp: In function ‘int main()’: user.cpp:18:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%lld", &a, &b); ^