10.7 Exercise

The answers for all exercises can be found in Section A.9.

10.7.1 Exercise [45 min]

Modify the RaceHorse class to get the previous standings from a DBM hash (keyed by the horse's name ) when the horse is created, and update the standings when the horse is destroyed . For example, running this program four times:

 my $runner = RaceHorse->named("Billy Boy"); $runner->won; print $runner->name, " has standings ", $runner->standings, ".\n"; 

should show four additional wins. Make sure that a RaceHorse still does everything a normal Horse does otherwise .

For simplicity, use four space-separated integers for the value in the DBM hash.