$scores begins with a value of zero, and is incremented in the foreach loop, which iterates over the @grades array. Chances are, your split() statement is returning an empty list leaving @grades empty and nothing for the foreach loop to do, so the value of $scores remains at zero and causes the error in $average = $total / $scores.

In reply to Re: Programming Perl 3rd ed. Chapter 1 by converter
in thread Programming Perl 3rd ed. Chapter 1 by blacksmith

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