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Posted by Jim Michaels on 11/09/01 11:42
<fritz-bayer@web.de> wrote in message
news:1141404106.485472.53880@z34g2000cwc.googlegroups.com...
> Hello,
>
> I'm porting a program from php to perl and discovered, that the bitwise
> operator & seems to work differently, which I don't understand why.
>
> I tested it with the values:
>
> a=5543039447 and b=13
>
> Then in perl the expressions:
>
> $result= ($z & $a);
>
> returns 2147483648.
>
> But in php the same expression returns zero. Why is that and how can I
> fix it?!
>
> Fritz
>
In my perl (ActivePerl 5.8.8.816 in WInXP 32-bit) I get 13 for a result.
5543039447=0x0000 0001 4A64 11D7
it's a 33-bit number, so that may be the cause of your problem right there.
undefined behavior after the bits get too big.
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