fig13_15.pl

PERL语言资料 可以用于PERL程序设计

#!/usr/bin/perl
# Figure 13.15: fig13_15.pl
# Demonstrates the use of typeglobs

use warnings;
use strict;
no strict 'vars';

$cow = "cow";
%cow = ( sound => "mooo" );
@cow = ( 'gills', 'brain', 'eyes', '', 'feet', '', 'udders' );

sub cow
{
print <<'DONE';

                 \__/
    _____________/oo\
   /              ||
  /|   _______   /
 /||  /|||    | |
   |_|        |_|
DONE
}        

*heifer = *cow;

print( "Printing Cow.\n" );
printAnimal( *cow );

$heifer[ 2 ] = 'nostrils';
$heifer[ 4 ] = 'stomachs';

print( "\nPrinting modified cow.\n" );
printAnimal( *cow );

print( "\nChanging the cow's name\n" );

{ 
   my $newname = "heifer";
   *heifer = \$newname;
}

printAnimal( *heifer );

sub printAnimal
{
   local *animal = shift();
   print( "A $animal goes $animal{ sound }!\n" );

   for ( my $i = $#animal; $i >= 0; $i-- ) {
      print( "A $animal has $i $animal[ $i ]!\n" )
         if ( $animal[ $i ] );
   }

   print( "A $animal looks something like this.\n" );
   animal();
}


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