ghinion.cpp: In function 'int verif(int)': ghinion.cpp:90: warning: right-hand operand of comma has no effect ghinion.cpp: In function 'int main()': ghinion.cpp:127: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ghinion.cpp:128: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ghinion.cpp:129: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result