Eroare de compilare: user.cpp: In function ‘int cmp_number(const int&, const int&)’: user.cpp:21: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘int main()’: user.cpp:46: error: ‘strlen’ was not declared in this scope user.cpp:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:45: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result