Hi,

another way you could implement this is using a hash of subroutine references, like so: 

use strict;
my $operator=<STDIN>;
my $op_map={};
my $one=10;
my $two=5;
chomp $operator;
define_op_map();
if ( defined ($op_map->{$operator}) ) {
  &{$op_map->{$operator}};
  } else {
  print "This op is undefined. Executing it might end the universe as 
+we know it.\n";
  }

sub define_op_map {
  $op_map->{'+'}=sub{print $one + $two . "\n"};
  $op_map->{'-'}=sub{print $one - $two . "\n"};
  $op_map->{'*'}=sub{print $one * $two . "\n"};
  $op_map->{'/'}=sub{print $one / $two . "\n"};
  }

[download]
This has the advantage that you can define arbitrary operators, such as: 
$op_map->{'camel'}=sub{print "$one is a $two with humps.\n"};

[download]
A more complicated way to do the above is to define the subroutine references in an array and then fill the op_map hash by looping over this array. That way extending the functionality of the thing is cleaner.

CU
Robartes-

In reply to Re: Inputing an Operator is it possible? by robartes
in thread Inputing an Operator is it possible? by $Variable_B

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.