Procedures and Functions

Question 1

What is the key difference between a function and a procedure?

Accepted Answer

A function returns a value; a procedure does not — A function returns a single value to the caller, whereas a procedure does not.

Question 2

What is a subroutine?

Accepted Answer

A named block of code that does one task — A subroutine is a named block of code that performs one task and can be called.

Question 3

What is a parameter?

Accepted Answer

A value passed into a subroutine — A parameter passes data into a subroutine so it can work on different values.

Question 4

In Area &larr; CalcArea(5, 4), CalcArea is a:

Accepted Answer

Function — It returns a value that is assigned to Area, so it is a function.

Question 5

Which is a benefit of using subroutines?

Accepted Answer

They avoid repeating the same code — Subroutines let one block be reused, avoiding repeated code.

Question 6

A subroutine that draws a shape but returns nothing is a:

Accepted Answer

Procedure — Because it performs a task without returning a value, it is a procedure.

Question 7

In CalcArea(5, 4), what are 5 and 4?

Accepted Answer

Parameters — The values 5 and 4 are passed into the subroutine as parameters.

Question 8

Where is a function usually used?

Accepted Answer

Inside an expression, because it returns a value — A function returns a value, so it is used within an expression or assignment.

Question 9

How is a procedure typically called?

Accepted Answer

Using a keyword such as CALL — A procedure is called on its own, often with a keyword like CALL.

Question 10

Why do subroutines help with testing a program?

Accepted Answer

Each can be tested separately — Splitting a program into subroutines lets each part be tested on its own.