4. Loops

Question 1

A ____ is a program construct that repeatedly executes statements while its expression is true and proceeds to subsequent statements once its expression is false.

Answer 1

loop

Question 2

A loop’s statements are known as the loop ____.

Answer 2

body

Question 3

Each time through a loop’s statements is called a(n) ____.

Answer 3

iteration

Question 4

A ____ value is a special value indicating the end of a list, such as a list of positive integers ending with 0, as in 10 1 6 3 0

Answer 4

sentinel

Question 5

What are the three components of a for loop?

Answer 5

1. Loop variable initialization (e.g., i = 0)
2. Loop expression (e.g., i < 10)
3. Loop variable update (e.g., i += 1)

Question 6

Which loop is best for situations in which the number of iterations is computable before the loop?

Answer 6

For loop

Question 7

Which loop is best for situations in which the number of iterations is not easily computable before the loop.

Answer 7

While loop

Question 8

A ____ loop is a loop that appears in the body of another loop. The two loops are referred to as the ____ loop and the ____ loop.

Answer 8

nested, inner, outer

Question 9

A ____ loop is a loop that first executes the loop body’s statements, then checks the loop condition.

Answer 9

do-while

Question 10

When is a do-while loop useful?

Answer 10

When the loop should iterate at least once