#!/usr/bin/perl
# Fig. 4.15: fig04_15.pl
# Creating and accessing hash elements

# create a hash and output its values
%hash = ( width => '300', 
          height => '150' );
print "\$hash{ 'width' } = $hash{ 'width' }\n";
print "\$hash{ 'height' } = $hash{ 'height' }\n\n";

# assigning to a new hash element
$hash{ 'color' } = 'blue';
print "\$hash{ 'width' } = $hash{ 'width' }\n";
print "\$hash{ 'height' } = $hash{ 'height' }\n";
print "\$hash{ 'color' } = $hash{ 'color' }\n\n";

# display a hash with print
print "%hash\n";      # no interpolation, unlike with arrays
print %hash, "\n";    # difficult to read, no spaces

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