What is Iteration:
Iteration is used in programming when a set of instructions are to be repeated. Sometimes this is called a loop.
Count Controlled Iteration:
Iteration in Scratch is when we repeat(loop) a block of code.
Count controlled iteration is used when theprogrammer (or at least the computer) knowshow many times the code needs to repeat.
In the example below, we arerepeating the ‘say’ blocks 10 times.
Condition Controlled Iteration:
There is another type of loop called Condition Controlled Iteration.
This makes use of While Loops.
These repeat only whilst a given condition is true.
We will look at this when we study Python later in the year.
Scratch Iteration Example:
It is even possible to see how many times the loophas gone around by introducing a ‘counter’ variable.
The counter can then be changed (increased) by 1each time the loop repeats.
Scratch Iteration – More Examples:
