Compilare: user.cpp: In function ‘int main()’: user.cpp:60: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:65: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:65: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result