Compilare: user.cpp: In function ‘void read(int&)’: user.cpp:16:90: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while( buff[pos]<'0'||buff[pos]>'9') if(++pos==buffs) fread(buff,1,buffs,stdin),pos=0; ^ user.cpp:21:57: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos==buffs) fread(buff,1,buffs,stdin),pos=0; ^