Lesson 15 Quiz: Functions: Reusable Blocks

1. What is a function, and what is the difference between defining one and calling one?

A. A named block of code; defining runs it, calling writes it. B. A named block of code; defining writes it, calling runs it. C. A single line of code; defining and calling are the same thing. D. A file that holds a program; defining saves it, calling deletes it.

2. What is a parameter, and what is an argument?

A. A parameter is the value handed in at the call; an argument is the name in the definition. B. A parameter and an argument are the same thing — two names for the value. C. A parameter is the result a function returns; an argument is the function itself. D. A parameter is the name in the definition; an argument is the value handed in at the call.

3. In `describe_pet("Biscuit", "dog")`, which argument goes to which parameter?

A. `"Biscuit"` goes to `animal`, `"dog"` to `name`, in order. B. Both `"Biscuit"` and `"dog"` go to `name`. C. `"Biscuit"` goes to `name`, `"dog"` to `animal`, in order. D. `"Biscuit"` goes to `name`, and `"dog"` is ignored.

4. What is the difference between printing a result and returning one?

A. Printing displays a value for a human; returning hands it back for the program to use. B. Printing hands a value back for the program to use; returning displays it for a human. C. Both display a value for a human; neither hands anything back. D. Both hand a value back to the program; neither displays anything.

5. Why is changing a greeting easier in the function version than in the repeated-lines version?

A. Because functions run faster than repeated lines. B. Because the greeting exists in one place — change it once, and every call uses the new version. C. Because the repeated-lines version has more errors in it. D. Because `greet()` only works once, so there is less to change.