fig13_02.pl

来自「PERL语言资料 可以用于PERL程序设计」· PL 代码 · 共 55 行

#!/usr/bin/perl
# Figure 13.2: fig13_02.pl
# Demonstrates how to use references to arrays and hashes.

use strict;
use warnings;

my @array = qw( duck pig horse rooster cow );
my %hash = ( duck    => "quack",
             pig     => "oink",
             horse   => "neigh",
             rooster => "cock-a-doodle-doo",
             cow     => "moo" );

my $arrayReference = \@array;
my $hashReference = \%hash;

sub returnReference
{
   return \@array;
}

print( "@$arrayReference\n" );

print( "\$\$arrayReference[ 1 ] = $$arrayReference[ 1 ]\n" );
print( "\$arrayReference->[ 1 ] = $arrayReference->[ 1 ]\n" );
print
 ( "\${returnReference()}[ 1 ] = ${returnReference()}[ 1 ]\n\n" );

print( "\$\$hashReference{ duck } = $$hashReference{ duck }\n" );
print
 ( "\$hashReference->{ duck } = $hashReference->{ duck }\n\n" );

foreach ( keys( %$hashReference ) ) {
   print( "The $_ goes $hashReference->{ $_ }.\n" );
}

###########################################################################
#  (C) Copyright 2001 by Deitel & Associates, Inc. and Prentice Hall.     #
#  All Rights Reserved.                                                   #
#                                                                         #
#  DISCLAIMER: The authors and publisher of this book have used their     #
#  best efforts in preparing the book. These efforts include the          #
#  development, research, and testing of the theories and programs        #
#  to determine their effectiveness. The authors and publisher make       #
#  no warranty of any kind, expressed or implied, with regard to these    #
#  programs or to the documentation contained in these books. The authors #
#  and publisher shall not be liable in any event for incidental or       #
#  consequential damages in connection with, or arising out of, the       #
#  furnishing, performance, or use of these programs.                     #
###########################################################################