(jeffa) Re: 99 bottles of beer on the Wall

[jeffa]

Not bad for a first program ... here is a less redundant version in the interest of helping you learn more:

#!/usr/bin/perl -w

use strict;

my $beer = abs shift || 99;

print how_many($beer), ",\n",
   how_many($beer), ".\n",
   "Take one down, pass it around,\n",
   how_many(--$beer), ".\n\n"
while $beer;

sub how_many {
   my $numb = shift;
   return $numb 
      . ' bottle' 
      . ($numb == 1 ? '' : 's')
      . ' of beer on the wall'
   ;
}

Instead of asking the user for the number of beers *hic*, the code instead gets the number as a command line argument. If no argument is supplied, it instead uses a default value of 99. Also, it counts down until $beer is a false value instead of until $beer is 0 - hence, we have to take the absolute value of that command line argument lest the user give us a negative value and spin us off into an infinite loop. This version also uses a subroutine and a ternary operator (expr ? true : false), which is just a fancy if-else that is used to avoid spouting out '1 bottles'.

Keep on coding! :)

UPDATE: oops, you are correct mystik - and yes, my vision was blurry last night! :D (typo corrected)

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

[mystik]

I'm pretty sure that you need to change how_many($beer--) to how_many(--$beer). After you take one down, and pass it around, unless your vision is blurrey, there's one fewer beer.

For the benefit of those that don't know, $var-- returns the value of $var, then decrements it. --$var first decrements, then returns $var

If the eval engine in my brain is correct, --$var++ will return $var - 1, but the value of $var will still be the same ;)

[Abigail-II]

And here's a different way:

#!/usr/bin/perl
use strict;
use warnings 'all';

use Lingua::EN::Inflect;

my $beer = abs (shift || 99);

sub UNIVERSAL::TIEHASH {bless [] => shift}
sub UNIVERSAL::FETCH   {no strict 'refs';
                        &{"Lingua::EN::Inflect::" . ref $_ [0]}
                                                   (split /$;/ => $_ [
+1])}
tie my %N => 'NUMWORDS';
tie my %B => 'PL';

print <<"--" while $beer;
   \u$N{$beer} $B{bottle => $beer} of beer on the wall,
   $N{$beer} $B{bottle => $beer --} of beer.
   Take one down,
   pass it around.
   \u$N{$beer} $B{bottle => $beer} of beer on the wall.

--
package NUMWORDS;
package PL;
__END__

[ignatz]

Getting rid of the warning and making it just a little bit prettier:

#!/usr/bin/perl -w

use strict;
use Lingua::EN::Nums2Words; 

my $beer = shift || 99;
$beer = abs($beer);

print how_many($beer), ",\n",
   how_many($beer), ".\n",
   "Take one down, pass it around,\n",
   how_many(--$beer), ".\n\n"
while $beer;

sub how_many {
   my $numb = &num2word(shift);
   $numb =~ s/(\w)(.*)/\u$1\L$2/;  
   return $numb
      . ' bottle' 
      . ($numb eq 'One' ? '' : 's')
      . ' of beer on the wall'
   ;
}

Requires Lingua::EN::Nums2Words.

()-()
 \"/
  `                                                     

[ignatz]

Here's the first joke that I can remember telling as a kid. It still cracks em up today.

#!/usr/bin/perl -w

use strict;
use Lingua::EN::Nums2Words; 

my $beer = shift || 99;
$beer = abs($beer);

for (-9..$beer) {
    print how_many($beer), ",\n",
       how_many($beer), ".\n",
       "Take one down, pass it around,\n",
       how_many(--$beer), ".\n\n"
}

sub how_many {
   my $numb = &num2word(shift);
   $numb =~ s/(\w)(.*)/\u$1\L$2/;  
   return $numb
      . ' bottle' 
      . ($numb eq 'One' ? '' : 's')
      . ' of beer on the wall'
   ;
}

()-()
 \"/
  `