## Forum archive 2000-2006

### Mark Schmitt - Number Theoretic Functions

by Arnold Pizer -
Number of replies: 0
 Number Theoretic Functions topic started 8/13/2001; 10:09:24 AMlast post 8/15/2001; 8:50:23 AM
 Mark Schmitt - Number Theoretic Functions  8/13/2001; 10:09:24 AM (reads: 1491, responses: 3) Has anyone written routines to calculate GCD, LCM, a Mod b, a | b, etc? If so, could you post the code? If not, I'll try to code them later this week. I need them to make a few factoring problems work. Thanks. Mark <| Post or View Comments |>

 Mark Schmitt - Re: Number Theoretic Functions  8/14/2001; 7:01:02 PM (reads: 1776, responses: 0) A follow-up to help anyone with a similar question. I've found that perl calculates a mod b using the code "$A %$B". I also found that somewhere in WeBWorK, gcd is defined. Is there a concise list of functions that are available to use as programmers somewhere? Mark <| Post or View Comments |>

 Thomas R. Shemanske - Re: Number Theoretic Functions  8/15/2001; 8:43:52 AM (reads: 1787, responses: 0) Some of these are in PGauxiliaryFunctions.pl. Another possible source is that of Perl builtins, for example see Cheers, Tom <| Post or View Comments |>

 Thomas R. Shemanske - Re: Number Theoretic Functions  8/15/2001; 8:50:23 AM (reads: 1754, responses: 0) Also, I found this piece of code in a sample problem, suggesting perl's a%b doesn't work well. sub mod { # for some reason perl's % doesn't seem to work for large numbers? my $a = shift; my$b = shift; $a - int($a/$b)*$b; } <| Post or View Comments |>