On Thu, Jul 3, 2008 at 9:47 PM, yitzle <[EMAIL PROTECTED]> wrote:
> On Thu, Jul 3, 2008 at 11:03 AM, Roy M <[EMAIL PROTECTED]> wrote:
>> Conside the following codes:
>>
>> use POSIX;
>>
>> print LONG_MAX, "\n";
>>
>> my $num = 99999999994;
>> print $num;
>>
>>
>> Why $num is bigger than LONG_MAX ?
>
> It is a string maybe?
>
OK. That wasn't clear. Perl doesn't have an int and string and char
datatypes per say. Perl has a scalar and an array and a hash.
Perl does this dynamic casting to int or string as needed. Consider
the following code:
perl -e 'use POSIX; print LONG_MAX . "\n"; my $x = LONG_MAX + 1;
print "$x\n"; my $y = LONG_MAX * 2; print "$y\n";'
I get the same number 3 times. But then I did this:
perl -e 'use POSIX; my $x = 99999999999; print "$x\n"; $x = ($x -
1) / 2; print "$x\n";'
It got no problems dealing with bigger numbers and does this
correctly... Not what I would have expected to be honest...
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
http://learn.perl.org/
