Possible Duplicate:
How do I create or test for NaN or infinity in Perl?
How can I check, if scalar holds inf value?
I check NaN as $scalar != $scalar, what to do with inf?
$scalar == inf does not work, since inf is a bareword
views:
187answers:
2
A:
I found a dirty hack right now.
($scalar eq "inf")
Does anything cleaner exist?
Karel Bílek
2010-02-13 07:17:40
Not good. Perl will stringify inf however the underlying libc does, and that can vary (both within the C standard and, on Windows, far outside it).
ysth
2010-02-14 04:22:53
A:
you can use this to check for infinity:
$scalar < 9**9**9
that constant is so large that it will be interpreted as infinite by Perl
Eric Strom
2010-02-13 10:10:43