Change 21204 by [EMAIL PROTECTED] on 2003/09/13 06:47:23
Subject: [perl #23788] int of a fraction errors
From: "Boyd, Brooks D" (via RT) <[EMAIL PROTECTED]>
Date: 11 Sep 2003 22:38:19 -0000
Message-ID: <[EMAIL PROTECTED]>
Add a separate faq entry for int(). (Yes, a bit redundant
with the existing "why are my numbers broken" entry.)
Affected files ...
... //depot/perl/pod/perlfaq4.pod#86 edit
Differences ...
==== //depot/perl/pod/perlfaq4.pod#86 (text) ====
Index: perl/pod/perlfaq4.pod
--- perl/pod/perlfaq4.pod#85~20981~ Mon Sep 1 04:28:35 2003
+++ perl/pod/perlfaq4.pod Fri Sep 12 23:47:23 2003
@@ -28,6 +28,24 @@
my $number = sprintf "%.2f", 10/3;
+=head2 Why is int() broken?
+
+Your int() is most probably working just fine. It's the numbers that
+aren't quite what you think.
+
+First, see the above item "Why am I getting long decimals
+(eg, 19.9499999999999) instead of the numbers I should be getting
+(eg, 19.95)?".
+
+For example, this
+
+ print int(0.6/0.2-2), "\n";
+
+will in most computers print 0, not 1, because even such simple
+numbers as 0.6 and 0.2 cannot be presented exactly by floating-point
+numbers. What you think in the above as 'three' is really more like
+2.9999999999999995559.
+
=head2 Why isn't my octal data interpreted correctly?
Perl only understands octal and hex numbers as such when they occur as
End of Patch.
