What is a loop used for?

• To repeat a function

• Test if a condition false

• To repeat code.

• Help write python questions

A While Loop runs until

• To repeat code.

• ​The test condition is false​____

• _​The test condition is true____

• To set the value of a variable before a loop

Loop control variable

• Variable used to end the loop.

• Variable used to count how many times something happens.

• To set the value of a variable before a loop.

What are the two ways of ending a loop?

• User input

• elif

• count done

• Count variable

Write a loop to print the numbers: 1, 2, 3, …20

• c = 1 while (c <= 21): print (c) (c = c + 1 )

• c = 0 while (c <= 21): print (c) c = c + 1

• c = 1 while (c <= 21): print (c) c = c + 1

Write a loop to print the numbers: 30, 31, 32, ….45. What did you have to do to c to get this one to work?

• c = 29 while (c <= 45): print (c) c = c + 1

• c = 30 while (c <= 45): print (c) c = c + 1

• c = 30 while (c <= 45): print (c) ( c and c + 1 )

Write a loop to print the numbers: 5, 10, 15, 20...45. What did you have to do to c to get this one to work?

• c = 45 while (c <= 45): print (c) c = c + 5

• c = 0 while (c <= 45): print (c) c = c + 5

• c = 5 while (c <= 45): print (c) c = c + 5

x = 1 while (x < 5): print (x) x = x + 1

• 0,1,2,3

• 1,2,3,4

• 2,3,4,5

• 10,11,12,13,14

x = 1 while (x < 5): x = x + 1 print (x)

• 1,2,3,4

• 0,1,2,3

• 2,3,4,5

x = 10 while (x > 5): print (x) x = x - 1

• 10,9,8,7,6

• 9,8,7,6,5

• 11,10,9,8