a chunk of code that repeatedly runs a section of the program a certain number of times

carefully following a program line by line to predict what it will do

Count-controlled loops

Computing

Programming a screen turtle

Create an algorithm for a text-based program

Patterns and repeats

Procedures in programming

Creating a program that uses loops

In this unit pupils will create text-based programs which use repetition. They will plan, modify, and test commands to create shapes and patterns. They will explore the different types of loops that can be used to repeat commands in a program.

Repetition in programs

What does the `fd` command control in a program?

The number controls the number of repetitions.

The number controls the size of the shape.

What is the relationship between a loop's number and its outcome?

What is the term for carefully following a program to predict its outcome?

Compare your prediction to the actual result.

Put these steps in order to trace a program.

Yes, because the number in the loop controls the size of the shape.

Yes, because a high number makes the turtle move further.

No, the number in the loop controls the number of sides, not the size.

No, the number in the loop has no effect on the shape.

Does a loop with a high number always create a big shape?

Correct this command to draw a triangle using the same size lines and angles: `repeat [fd 100 rt 120]`

moves the turtle to its starting position

What does the `repeat` command do in a program?

a loop that repeats a task until a condition is met

a loop that repeats a specific number of times

a precise sequence of steps to solve a task

What happens if you change the value of a command?

What does the `home` command do in a turtle program?

What is the term for the rules about how a programming language should be written?

Count-controlled loops

Lesson outcome