Make a copy of the program you wrote for the previous assignment (assignment 5, program 4), and modify that copy so that each of the functions you defined returns its result by modifying one or more pass-by-address parameters, rather than by using a return statement. That is, all user-defined functions in the program must have return type void, and the keyword return must not be used in any function definition. However, your program still must keep track of the result of the previous computation so that the redisplay option can be implemented. As always, you are not allowed to use any global variables.

This program should have the same functionality as the previous program, so that users of the program will still be able to do all of the same things. However, you can improve the user interface if you like.

To hand in:

• Either turn in a print out of your source code, or email me (wahls@psu.edu) the file containing your source code. If you email me the program, I will email you your score and any comments on your program sometime after the due date. I will also save a copy of your program to prevent later disputes.
• Your code will be graded on correctness (and how well you followed the instructions in this assignment handout), readability, the clarity of messages printed for the user and appropriate use of comments.

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