Cute. Does that really give the same distribution as knowing the number of lines in advance?

Update: The definitive answer

use strict;
use warnings;

sub trial($)
 {
 my $result;
 foreach (1..shift) {
    $result= $_  if rand($_) < 1;
    }
 return $result;
 }

############

my $trials= shift || 1000;
my $size= shift || 20;
my %results;

for (1..$trials) {
   ++$results{trial($size)};
   }

# show the results
for (1..$size) {
   printf "%5d: %5d\n", $_, ($results{$_} || 0);
   }

[download]

In reply to Re: Re: Random entry from combined data set by John M. Dlugosz
in thread Random entry from combined data set by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.