Borderou de evaluare (job #560889)

Compilare: user.cpp: In function ‘int main()’: user.cpp:44:21: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:13:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:14:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:44:19: warning: ‘n’ may be used uninitialized in this function [-Wuninitialized]