What is a While Loop?
A While loop repeats a set of instructions for as long as a condition remains true. As soon as the condition becomes false, the loop stops. In PictoBlox, this is represented by the Repeat Until block — which keeps repeating until the condition becomes true.
In PictoBlox, the 'Repeat Until ()' block works like a While loop. It repeats its contents until the given condition becomes true — meaning it runs while the condition is false.
How the While Loop Works
- The condition is checked before each repetition.
- If the condition is false, the blocks inside the loop run.
- After running, the condition is checked again.
- This continues until the condition becomes true, at which point the loop stops.
Example: Counting Up to 10
Let's use a Repeat Until loop to count from 1 to 10. We'll use a variable called Counter that starts at 0 and increases by 1 each time the loop runs.
- Create a variable called Counter.
- Add a 'When flag clicked' block.
- Set Counter to 0.
- Add a 'Repeat Until (Counter = 10)' block.
- Inside the loop, add 'Change Counter by 1' and 'Say (Counter) for 0.5 seconds'.
- Click the green flag and watch the sprite count from 1 to 10!
Be careful with While loops! If the condition never becomes true, the loop will run forever and your program will get stuck. This is called an infinite loop.
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