Compilare: user.cpp: In function ‘int cmmdc(int, int)’: user.cpp:18: warning: left-hand operand of comma has no effect user.cpp: In function ‘int main()’: user.cpp:59: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:60: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result