Section A.9.  Answers for Chapter 10

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A.9. Answers for Chapter 10

A.9.1. Exercise 1

Here's one way to do it. First, start with the package directive and use strict:

package Oogaboogoo::date;
use strict;

Then define the constant arrays to hold the mappings for day-of-week and month names:

my @day = qw(ark dip wap sen pop sep kir);
my @mon = qw(diz pod bod rod sip wax lin sen kun fiz nap dep);

Next, define the subroutine for day-of-week number to name. Note that this subroutine will be accessible as Ooogaboogoo::date::day:

sub day {
  my $num = shift @_;
  die "$num is not a valid day number"
    unless $num >= 0 and $num <= 6;

Similarly, you have the subroutine for the month-of-year number to name:

sub mon {
  my $num = shift @_;
  die "$num is not a valid month number"
    unless $num >= 0 and $num <= 11;

Finally, the mandatory true value at the end of the package:


Name this file date.pm within a directory of Oogaboogoo in one of the directories given in your @INC variable, such as the current directory.

A.9.2. Exercise 2

Here's one way to do it. Pull in the .pm file from a place in your @INC path:

use strict;
require 'Oogaboogoo/date.pm';

Then get the information for the current time:

my($sec, $min, $hour, $mday, $mon, $year, $wday) = localtime;

Then use the newly defined subroutines for the conversions:

my $day_name = Oogaboogoo::date::day($wday);
my $mon_name = Oogaboogoo::date::mon($mon);

The year number is offset by 1900 for historical purposes, so you need to fix that:

$year += 1900;

Finally, it's time for the output:

print "Today is $day_name, $mon_name $mday, $year.\n";

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