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| author | Michael G. Schwern <schwern@pobox.com> | 2001-05-29 19:51:32 +0100 |
|---|---|---|
| committer | Jarkko Hietaniemi <jhi@iki.fi> | 2001-05-29 20:13:54 +0000 |
| commit | 1affb2ee4597bbf287e792c440907d25929aff2e (patch) | |
| tree | 83b87f0b89211ac4ed9c1c5c82b5f249cd8c89b7 /pod/perlfaq4.pod | |
| parent | f1c689a86c4d291fc38042ab6974540507ad0175 (diff) | |
| download | perl-1affb2ee4597bbf287e792c440907d25929aff2e.tar.gz | |
Example of working in integers to avoid floating point errors
Message-ID: <20010529185132.C706@blackrider.blackstar.co.uk>
p4raw-id: //depot/perl@10301
Diffstat (limited to 'pod/perlfaq4.pod')
| -rw-r--r-- | pod/perlfaq4.pod | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/pod/perlfaq4.pod b/pod/perlfaq4.pod index 069340dabd..87fd66a777 100644 --- a/pod/perlfaq4.pod +++ b/pod/perlfaq4.pod @@ -39,6 +39,11 @@ arbitrary-precision decimal numbers with the Math::BigFloat module (part of the standard Perl distribution), but mathematical operations are consequently slower. +If precision is important, such as when dealing with money, its good +to work with integers and then divide at the last possible moment. +For example, work in pennies (1995) instead of dollars and cents +(19.95) and divide by 100 at the end. + To get rid of the superfluous digits, just use a format (eg, C<printf("%.2f", 19.95)>) to get the required precision. See L<perlop/"Floating-point Arithmetic">. |