A thousand pardon for this silly question (been away for a while)

I need to read in a list of numbers and make sure that the numbers start at 1 and increment by 1 until the end of the list. So...

  • 1 2 3 4 5 would return a success.
  • 3 2 1 4 5 would return a success.
  • 2 3 1 1 6 would return a failure
  • 1 2 4 5 6 would return a failure

    • I have the following code (which works) and was wondering if there is another way of doing this.. I could not find a module on CPAN after a little search earlier today.

    #! /usr/bin/perl

use strict;
use warnings;

print "Please enter a list of numbers (I.e. 1 2 3 4 5)\n";

chomp(my $n = <STDIN>);
my @numlist = split/\s/, $n;

@numlist = sort { $a <=> $b } @numlist;

if ($numlist[0] == 1) {
    print "Horray Array starts at 1\n";
    my $prevnum = 0;
    foreach my $number (@numlist) {
        unless (($prevnum + 1) == $number) {
            print "Error in Sequence";
            $prevnum = 0;
            last;
        }
        else {
            $prevnum = $number;
        }
    }
    if ($prevnum) {
        print "The numbers are correct\n";
    }
}
else {
    print "Error Array DOES NOT Start at 1\n";
}

    [download]

    P.S. the verbose code is to try and help with readability

    -----
    Of all the things I've lost in my life, its my mind I miss the most.

    In reply to Validate array of numbers in sequence by AcidHawk

    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.