Computer Science LearnITWithMrC ⛯ Year 7 Year 8 Year 9 GCSE
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# Lesson 5 - Iteration - loops

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##### Learning Objectives
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IDSkill_name
6 I can use iteration (looping) with a basic understanding

## Iteration

There are two ways in which programs can iterate or ‘loop’:
1. count-controlled loops (for loops)
2. condition-controlled loops (while or repeat loops)

We are going to look at while loops.

## Blast Off

### Copy the code below to print out the blastoff countdown

Run you code, does it output the blastoff countdown?

If it does then try the tasks below.

• Change the value of n and the calculation of n (n = n - 1) so that your output looks like the examples below:
• Example 1

```
7
5
3
Blastoff
1

>>>

```

Now try the harder exercises where we are counting up?

#### Extension

Example 2

```
0
1
3
6
I am counting up
10
>>>
```

Example 3

```
3
7
12
18
25
I am counting up
33
>>>
```

### Understanding Activity

Click on the bitesize button to learn all about loops.

Complete the Bitesize test at the end when you have finished.

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