Python while loops

For the code shown, what will happen?

• It will print all the numbers from 0 to 11

• It will print all the numbers from 0 to 11 in increments of 3

• Infinite loop

• It will not run (Syntax error)

A while loop is used when

• You know how many times you are going to loop

• You want to loop for an unknown number of times, and possibly forever

• You only want to run the code in the loop once

• You see the word while in the problem description

What is the final value of n?

(a)  

Why is iteration important?

• It determines the order in which instructions are carried out

• It allows code to be simplified by removing duplicated steps into a block that can be executed many times

• It allows multiple paths through a program

• It ensures the code works correctly

What is the output of this code?

• It would print 'So good to see you' infinite number of times

• There would be no output

• It would print an error message.

• It would print 'Enter correct code'.

The condition for a while loop to continue could include which of the following?

• While something equals something

• While something is True

• While something is greater than something

• All of these

What is the final value of the variable 'number'?

(a)  

What is the output?

• 5

  4

  3

  2

  1

• 5 4 3 2 1

• 4

  3

  2

  1

  0

• 4 3 2 1 0

To increment means to

• increase the value of a variable

• decrease the value of a variable

• add 1 to the variable

• subtract 1 from the variable

What is the output?

• 12 9 6 3 0

• 0 3 6 9 12

• 0 3 6 9

• 9 6 3 0