Compilare: main.cpp: In function 'int upd(int, int)': main.cpp:78:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:13:29: 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); ^