And how does this help the OP?

In case you hadn't noticed, this is a homework question. Giving the OP a working solution (that they likely won't understand) isn't the aim here - helping the OP develop their own working solution (whilst learning the skills required to do so) is the entire point of the exercise.

In reply to Re^2: [Homework Question] Subroutines & References by SimonPratt
in thread [Homework Question] Subroutines & References by Hayest

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