程嶏清单9-10.txt

< linux网络编程工具>>配套源码

sub dec2bin {
    my $str = unpack("B32", pack("N", shift));
    $str =~ s/^0+(?=\d)//;   # otherwise you'll get leading zeros
    return $str;
}
sub bin2dec {
    return unpack("N", pack("B32", substr("0" x 32 . shift, -32)));
}
$num = bin2dec('0110110');  
$binstr = dec2bin(54);