Class 9 Computer Science — Repeating while something is true

1.Look at the condition before you follow anything. What does this program print?

n = 5
while n > 10:
    n = n + 1
print(n)

• a) 5
• b) 11
• c) 10
• d) 6

2.Money is put by each week until there is enough. What does this program print?

money = 50
weeks = 0
while money < 200:
    money = money + 25
    weeks = weeks + 1
print(weeks)

3.A second variable here does nothing but count the trips. What does the program print?

count = 0
total = 0
while total < 30:
    total = total + 7
    count = count + 1
print(count)

4.In each of these a variable starts at 0 and the body adds 1 to it every time round. Sort each condition by how many times the body runs.

5.This loop doubles a number until the condition stops holding. What does the program print?

n = 1
while n < 20:
    n = n * 2
print(n)

6.In each of these a variable is changed as described and the loop keeps going while the variable is below 40. Put them in order of the value the variable is left holding, smallest first.

• Starts at 1 and is doubled each time
• Starts at 2 and is multiplied by 3 each time
• Starts at 6 and has 15 added each time
• Starts at 10 and has 9 added each time

7.Both variables change every time round here, and only one of them is in the condition. What does the program print?

total = 0
n = 1
while total < 20:
    total = total + n
    n = n + 1
print(n)

8.The subtraction here takes the variable past the condition and keeps going. What does the program print?

n = 27
while n > 0:
    n = n - 4
print(n)