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

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

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'?

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

A counter is (check ALL that apply)

• A variable used in a loop to count the number of times something happened

• usually initialised to zero

• usually incremented inside the loop

• a person with a pen and paper

• used only outside of the loop

What is the output?

• 12 17 22

• 12

• 5

• 5 10

What is the output?

• Hello world

• Hello there

• Error

• Hello there

  Hello there

  Hello there

  Hello there

  Hello there

  ...(forever)

What is the output?

• Hello world!

  Hello world!

  Hello world!

  Hello world!

  Hello world!

  Hello world!

  (repeated continuously)

• Hello world!

• Hello world!

  break

• Error