Pls use (processing java) knowledge to solve this question.

Exercise 3. The following code calculates the weight of a pack of pens. The size of a pack of pens never changes it always contains 10 pens. Also, the weight is fixed. Update the following code to used named constants for both of these. There is a catch, what is it? Type it in processing to see. = int pens = 10; int penWeight_g 10; int totalWeight_g pens * penWeight_g; pens pens 1; // remove one from the box =