diff options
| author | Boyd, Brooks D <unknown> | 2003-09-11 22:38:19 +0000 |
|---|---|---|
| committer | Jarkko Hietaniemi <jhi@iki.fi> | 2003-09-13 06:47:23 +0000 |
| commit | 32969b6e12eabd4800008f3f0270114b7962c5e1 (patch) | |
| tree | ef28817ef773cc80a6bd01eb9fb151b1c352b9a0 /pod/perlfaq4.pod | |
| parent | 363c40c40eaf5d0cfd92f460a3f838c41f9756ad (diff) | |
| download | perl-32969b6e12eabd4800008f3f0270114b7962c5e1.tar.gz | |
[perl #23788] int of a fraction errors
From: "Boyd, Brooks D" (via RT) <perlbug-followup@perl.org>
Message-ID: <rt-23788-64511.8.7546744242259@rt.perl.org>
Add a separate faq entry for int(). (Yes, a bit redundant
with the existing "why are my numbers broken" entry.)
p4raw-id: //depot/perl@21204
Diffstat (limited to 'pod/perlfaq4.pod')
| -rw-r--r-- | pod/perlfaq4.pod | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/pod/perlfaq4.pod b/pod/perlfaq4.pod index af08e473ee..e2054e49bd 100644 --- a/pod/perlfaq4.pod +++ b/pod/perlfaq4.pod @@ -28,6 +28,24 @@ L<"Floating Point Arithmetic"|perlop> for more details. 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 |