Compilare: user.cpp: In function ‘int main()’: user.cpp:156:12: warning: unused variable ‘nr’ [-Wunused-variable] int i,q,k,nr,next; ^ user.cpp:156:15: warning: unused variable ‘next’ [-Wunused-variable] int i,q,k,nr,next; ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:30:29: 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); ^