elsif (/[W_]/) { # other chars
                  print "huh? That *really* doesn't look like a number\n";
              }

##</code><code>##

#!/usr/bin/perl -w
# number speller: prints out word approximations of numbers
# simple version, only does single digits

$exit = "";  # whether or not to exit the script

while ($exit ne "n") {

    while () {
         print 'Enter the number you would like to spell (0-9): ';
         chomp($_ = <STDIN>);
         if (/^\d$/) {
             print "Thanks!\n";
             last;
         } elsif (/^$/) {
              print "You didn't enter anything.\n";
         } elsif (/\D/) {  # nonnumbers
             if (/[a-zA-Z]/) { # letters
                 print "You can't fool me. There are letters in there.\n";
              } elsif (/^-\d/) { # negative numbers
                  print "That's a negative number. Positive only, please!\n";
              } elsif (/\./) { # decimals
                   print "That looks like it could be a floating point numer.\n";
                   print "I can't spell a floating point number. Try again.\n";
              } elsif (/[W_]/) { # other chars
                  print "huh? That *really* doesn't look like a number\n";
              }
          } elsif ($_ > 9) {
              print "Too big! 0 through 9, please.\n";
          }
    }

    print "Number $_ is ";
    /1/ && print 'one';
    /2/ && print 'two';
    /3/ && print 'three';
    /4/ && print 'four';
    /5/ && print 'five';
    /6/ && print 'six';
    /7/ && print 'seven';
    /8/ && print 'eight';
    /9/ && print 'nine';
    /0/ && print 'zero';
    print "\n";

    while () {
       print 'Try another number (y/n)?: ';
       chomp ($exit = <STDIN>);
       $exit = lc $exit;
       if ($exit =~ /^[yn]/) {
           last;
       }
       else {
           print "y or n, please\n";
       }
    }
}