Compilare: user.cpp: In function ‘int main()’: user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp:33: warning: array subscript has type ‘char’ user.cpp:34: warning: array subscript has type ‘char’ user.cpp:26: warning: unused variable ‘n’ user.cpp:20: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result