1. Iteration
Learning Objective: to be able to design algorithms that use iteration.

2. Right Motor Forward Off
Algorithm Efficiency
This algorithm isn’t very efficient as it contains repeated sets of instructions.
Start
Stop
Left Motor Forward On
Delay 2
Left Motor Forward Off
Right Motor Forward On
Right Motor Forward Off

3. Right Motor Forward Off
Iteration
Iteration allows us to repeat sets of instructions.
This algorithm repeats the same set of instructions forever.
Start
Left Motor Forward On
Delay 2
Left Motor Forward Off
Right Motor Forward On
Right Motor Forward Off
LOOP
RightMotor.forward(off)
LeftMotor.forward(on)
DELAY(2)
LeftMotor.forward(off)
RightMotor.forward(on)
ENDLOOP

4. Predict what this program will do:
Activity 1
Here is the program code for the algorithm given on the previous slide.
Predict what this program will do:
Prediction:
Now write this program and test it on Bobbot.

5. Activity 2 LOOP RightMotor.forward(on) ENDLOOP
Complete this design in pseudocode for an algorithm that will make Bobbot go forwards and backwards continually.
LOOP
RightMotor.forward(on)
ENDLOOP

6. Place a screenshot of your code here:
Activity 3
Use Touch Develop to create the program you designed in activity 2 and test it on Bobbot.
Place a screenshot of your code here:

7. This instructions inside this FOR loop will be repeated 10 times.
FOR Loops
It is also possible to repeat a group of instructions a set number of times. We use a FOR loop to do this.
This instructions inside this FOR loop will be repeated 10 times.
FOR X = 1 TO 10:
RightMotor.forward(off)
LeftMotor.forward(on)
DELAY(2)
LeftMotor.forward(off)
RightMotor.forward(on)
ENDFOR
Pseudocode
Program Code

8. Activity 4
Adapt the algorithm you designed in activity 2 so that the instructions only repeat 5 times.

9. Place a screenshot of your code here:
Activity 5
Use Touch Develop to create the program you designed in activity 4 and test it on Bobbot.
Place a screenshot of your code here:

10. Activity 6
Design an algorithm in pseudocode that makes Bobbot move in a zig zag like the pattern shown below:

11. Place a screenshot of your code here:
Activity 7
Use Touch Develop to create the program you designed in activity 6 and test it on Bobbot.
Place a screenshot of your code here: