IP地址的合法性及子网判断

}

}

return;

if( ( iSubA) == (iIPA & iMask) ){ //IP和掩码与，结果和子网号比较 }

//ip不属于subnet else

cout<<\if( ( iIPA | iMask) == iMask ){ //说明主机号全0 }

if( ( iIPA | iMask ) == 0xffffffff ){ //说明主机号全1 }

//ip属于subnet

cout<<\

return;

cout<<\主机号全1,error!\return;

cout<<\主机号全0,error!\return;