Unclear Sentence in Section 4.3 about functions

[daizenj]

What Course are you in
Knowing the course will help us a lot

cpp4python

What Page were you on

Section 4.3

What is your username

njounkengdaizem

Describe the bug
A clear and concise description of what you were trying to accomplish and what went wrong. Vague statements like X does not work are not helpful. Imagine if one of your students sent you an email that said, "My program doesn't work, what's wrong with it?" Could you help them with only that to go on?

What does this mean: "Functions can be used with array parameters to maintain a structured design."

Traceback
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Section 4.3 > Line 2