Exam-style question
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Explain how parameters allow the following Python subroutine to be reused with different data. Include two example calls and the value printed by each call. ```python def showDifference(first, second): print(first - second) ```.
Model answer
What a good answer should say
- The parameters `first` and `second` act as named places for data supplied when the subroutine is called.
- For example: ```python showDifference(10, 4) ``` prints 6, while: ```python showDifference(20, 7) ``` prints 13.
- The same subroutine is reused because different arguments can be passed through its interface.
Explanation
Why this works
Parameters separate the subroutine's instructions from the particular data being processed. Each call supplies new argument values, which are used by the same calculation.
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