I'm tempted to take this approach (assuming you're only dealing with single letter answers):

#! /usr/bin/perl
use strict;

my %test = (
question1 => 'a',
question2 => 'b',
question3 => 'a',
);

#my hash of arrays with multiple answers
my %answers = (
question1 => [
              'a'
              ],
question2 => [
             'b',
             'd'
              ],
question3 => [
             'b'
             ],
);

my $q_count = keys %answers;
my $grade = 0;

for ( keys %answers ) {
    $grade++ if "@{$answers{$_}}" =~ /$test{$_}/i;
}

print "You got $grade out of $q_count right.$/";
[download]

Hello DamnDirtyApe
Could you please decode for me the regexp, so I can adapt it?
Actually some others test, have the answer type, not the option (one letter), so I could change the regexp. Thanks

There's not really anything to decide. Putting an array inside quotes returns a scalar with the array contents, so if $foo == [ 'a', 'b' ], then "@$foo" == "ab". The regexp searches that string for the answer, so if the answer given was "b", what were essentially doing is "ab" ~= /b/i. This will match, and the correct grade counter is incremented.

Make sense?


_______________
DamnDirtyApe

Those who know that they are profound strive for clarity. Those who
would like to seem profound to the crowd strive for obscurity.
            --Friedrich Nietzsche

Perhaps something like this? Tweak it all you like :)

#!c:/perl/bin/perl -w
$|++;

use strict;

my @questions = (
   {
      question => 'What perl site is a great learning tool?',
      answers  => {
         perlmonks   => 1,  # 1 for correct answer
         javajunkies => 0,  # 0 for incorrect answer
         microsoft   => 0
      }
   },

   {
      question => 'Pick a valid color:',
      answers  => {
         red   => 1,  # multiple correct answers
         blue  => 1,  # permitted
         sheep => 0,
         cow   => 0
      }
   }
);

my $correct = 0;

for my $question (@questions) {
   print "\n\nQ: ", $question->{'question'}, "\n",
      'A: ', join(', ', keys %{$question->{'answers'}}), "\n\n";

   print 'Your answer: ';
   chomp( my $ans = <STDIN> );

   ++$correct if ($question->{'answers'}->{lc $ans});
}

print "\n\nYour grade is ", +(int($correct/@questions*100)), "%.\n",
   "You answered $correct questions correctly.\n\n";
[download]