Many others have answered your immediate question. I note that your code actually would do multiplication and addition.

You may be interested in another way of doing the calculator thing. You may be interested in adding some more operators to this example.

use strict;
use warnings;

while (1)
  {
  print "\nEnter a number to add or multiply or nothing to exit: ";
  my $first = <STDIN>;
  chomp $first;

  last if 0 == length $first;

  print "Enter a second number: ";
  my $second = <STDIN>;
  chomp $second;

  print "Enter the operator (+ or *): ";
  my $op = <STDIN>;
  chomp $op;
  
  if ($op =~ /^[+*]$/)
    {print "$first $op $second = " . eval ("$first $op $second") . "\n
+";}
  else
    {
    print "$op is neither + nor *.\n";
    next;
    }
  }

[download]
Perl is Huffman encoded by design.

In reply to Re: Debug basic calculator syntax by GrandFather
in thread Debug basic calculator syntax by ROB6789

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.