Compilare: user.cpp: In function ‘int main()’: user.cpp:155:14: warning: unused variable ‘ok’ [-Wunused-variable] bool ok = true; ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:17:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1,4096, fin); ^