Compilare: user.cpp: In function ‘int MOD(char*, int)’: user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp:27: warning: unused variable ‘i’ user.cpp: In function ‘int main()’: user.cpp:41: warning: unused variable ‘x’ user.cpp:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result