12,345.678 not 12345.678

Posted on 2003-03-18
Medium Priority
Last Modified: 2010-03-05

Is there any way that I can print out a number in the format 12,345.678

Question by:Norman_SK
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1 Comment
LVL 20

Accepted Solution

jmcg earned 140 total points
ID: 8159147
It takes an extra step, there's no direct formatting support. Here's what it says in the Perl FAQ:

    sub commify {
               local $_  = shift;
               1 while s/^([-+]?\d+)(\d{3})/$1,$2/;
               return $_;

           $n = 23659019423.2331;
           print "GOT: ", commify($n), "\n";

           GOT: 23,659,019,423.2331

       You can't just:


       because you have to put the comma in and then recalculate
       your position.

       Alternatively, this commifies all numbers in a line
       regardless of whether they have decimal portions, are pre-
       ceded by + or -, or whatever:

           # from Andrew Johnson <ajohnson@gpu.srv.ualberta.ca>
           sub commify {
              my $input = shift;
               $input = reverse $input;
               $input =~ s<(\d\d\d)(?=\d)(?!\d*\.)><$1,>g;
               return scalar reverse $input;

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