Compilare: main.cpp: In member function 'InParser& InParser::operator>>(char*)': main.cpp:38:27: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while(c = read_ch()) { ^ main.cpp: In function 'int main()': main.cpp:168:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < All.size(); ++i) ~~^~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:20:38: 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); ^