#!/usr/bin/perl -w

#######################################################
# class3_02_hash_reverse
#
# see how reverse works with a hash: making keys
# into values, and vice versa!
#
# modified by Sharon Tuttle from "Learning Perl",
#    by Schwartz and Phoenix
#
# last modified: 4-13-03
#######################################################

%order_totals = ("chocolate", 13, "hamburger", 10, "tofu dog", 12);

%totals_ordered = reverse %order_totals;

print "\$totals_ordered{13}: $totals_ordered{13}\n";
print "\$totals_ordered{10}: $totals_ordered{10}\n";
print "\$totals_ordered{12}: $totals_ordered{12}\n";

# what if a VALUE is in the hash twice? When reversed, the key for
# the "later" will overwrite the key for the "former";

$order_totals{"shake"} = 12;

print "\nNow 12 is a value for two different keys...\n";
print "   BUT when reversed, key 12 will get only 1 value:\n\n";

%totals_ordered = reverse %order_totals;

print "\$totals_ordered{13}: $totals_ordered{13}\n";
print "\$totals_ordered{10}: $totals_ordered{10}\n";
print "\$totals_ordered{12}: $totals_ordered{12}\n";

# end of class3_02_hash_reverse