Chapter 5-Loops

Question 1

What does a loop do?

Answer 1

A loop can be used to tell a program to execute statements repeatedly.

Question 2

What does a while loop do?

Answer 2

A while loop executes statements repeatedly as long as the condition remains true. If the condition does not remain true, then python will exit the loop

Question 3

Why is indentation important in the while loop (and all loops for that matter?) ?

Answer 3

Without indentation in the while loop, we may be left with an infinite loop where the continuation condition is always true. For example:

sum=0
i=1
while i<10:
    sum=sum+i
i=i+1

the i=i+1 does not update the loop because it is not indented inside the loop and therefore the loop is infinite.

Question 4

What is a while loop?

Answer 4

A condition-controlled loop; it is controlled by true/false conditions

Question 5

What is a for loop?

Answer 5

A count-controlled loop, which repeats a specified number of times.