#!/usr/bin/perl -wT
use strict;
use CGI qw( :standard );
use CGI::Carp qw( fatalsToBrowser );

# use CGI
# print "Content-type: text/html\n\n";
print header,start_html();

# When I read this I assumed these variables would be
# the text of the question but they are the text
# of the answers, but as you see later you don't need them.
=head1
my ( $question_one,
     $question_two,
     $question_three,
     $question_four,
     $question_five,
     $question_six,
     $question_seven,
     $question_eight,
     $question_nine,
     $question_ten );
=cut

# These you don't need yet;       
#my $total = 10;
#my $score;
#my $final_score;

# If you use leading zeros in the names they sort
# and loop naturally ie Q01, Q02, Q03
# You have the answers in the parameter hash so no
# need to copy them
=head1
$question_one   = param( "Q1" );
$question_two   = param( "Q2" );
$question_three = param( "Q3" );
$question_four  = param( "Q4" );
$question_five  = param( "Q5" );
$question_six   = param( "Q6" );
$question_seven = param( "Q7" );
$question_eight = param( "Q8" );
$question_nine  = param( "Q9" );
$question_ten   = param( "Q10" );
=cut


# The correct answers I would put in a DATA block at the end
# and read them in here but there are lots of formats
# you could use
my %correct = ();
while (<DATA>){
  chomp;
  my $id    = substr($_,0,3);
  my $value = substr($_,4);
  $correct{$id} = $value;
}

# It's easy now to loop around the
# questions checking the answers
# and updating the score
my $total = 0;
my $score = 0;
foreach (sort keys %correct){
    my $answer  = param($_) || ""  ; # The || gives it defaults, and   
    my $correct = $correct{$_}     ; # using temp variables make it easier to read
    
    # marking
    my $result;
    if ($answer eq $correct){
       $result = qq(<font color="green">Correct</font>);
       ++$score;
    } else {
       # It's nice to know what the correct answer was
       $result = qq(<font color="red">Incorrect The Correct answer was $correct</font>);
    }
    
    # use qq to avoid all those \'s
    print qq[$_ ). You answered : $answer $result <br>\n ]; # use [ because of ) in text
    ++$total;
}

# work out the % marking to 1 decimal place
my $mark = 100 * $score / $total  unless $total == 0; # avoid div by zero error
$mark = sprintf "%.1f",$mark;

# use the cgi module and
# since you have a table you can
# use 2 columns to make it look neat
print table (
  Tr( td ("Total questions"), td ($total) ),
  Tr( td ("Correct"), td ($score) ),
  Tr( td ("% Score"), td ($mark) )
);
print end_html();

__DATA__
Q01 Larry Wall
Q02 Unix administrators
Q03 Text processing
Q04 Glue
Q05 Operating system utilities and services
Q06 True
Q07 Regular expressions
Q08 Open source
Q09 TCL
Q10 Marc Andreessen