Always use strict and warnings:

use strict;
use warnings;

They are your friends:

> ./crop.pl
Global symbol "$response1" requires explicit package name at ./crop.pl
+ line 41.
Global symbol "$response1" requires explicit package name at ./crop.pl
+ line 48.
Execution of ./crop.pl aborted due to compilation errors.

[download]

To get even that far I had to add some "my" statements:

#!/usr/bin/perl

use strict;
use warnings;

print "Content-type: text/html\n\n";
use CGI qw(:standard);

my $cornplanted=0;
my $cornnotplanted=0;

#@number1=("12" .. "25");
#$number1rand=$number1[rand @number1];
my $number1rand=int(rand(20));
my $number2=int(rand(12));

my $correctanswer=($number1rand + $number2);

print "$correctanswer <br>";

my $output=<<_html_;

<html>
<body>
<form method="post" action="foodaddition.cgi" name="form2">
Crops planted: $cornplanted <br>
<input type="hidden" name="$cornplanted" id="$cornplanted" />
Crops not planted: $cornnotplanted <br>
<input type="hidden" name="$cornnotplanted" id="$cornnotplanted" />
What does this math problem equal? <br>
$number1rand + $number2 = <input type="text" name="response1" id="resp
+onse1" />
<input type="hidden" name="response1" id="response1" />
<input type="submit" name="submit" value="Submit" />
</form>
</body>
</html>

_html_
print $output;

if ($response1 eq "$correctanswer")
{
    $cornplanted=($cornplanted + 1);
    print "correct!";

}

elsif ($response1 ne "$correctanswer")
{
    $cornnotplanted=($cornnotplanted + 1);
    print "not correct!";

}

[download]

You'll do much better to read the section CREATING FILL-OUT FORMS in the CGI.pm documentation and generate your form fields following proper CGI.pm practice.

To debug your script, follow the recommendations in the DEBUGGING section of the CGI.pm docs.

In reply to Re: having trouble with simple math game by tod222
in thread having trouble with simple math game by mynameisG

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