Compilare: user.cpp: In member function ‘char Reader::gLetter()’: user.cpp:61:16: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] return NULL; ^ user.cpp: In function ‘int main()’: user.cpp:133:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tabara2.in", "r", stdin); ^ user.cpp:134:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tabara2.out", "w", stdout); ^ user.cpp: In member function ‘char Reader::gChar()’: user.cpp:42:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, buffer, 1, stdin); ^