Compilare: main.cpp: In member function 'InParser& InParser::operator>>(long long unsigned int&)': main.cpp:50:43: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] n = (n << 3ull) + (n << 1ull) + c ^ '0'; ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:14:38: 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); ^