1. Phil Campbell London South Bank University
Pseudocode
Process Modelling
Phil Campbell London South Bank University

2. Phil Campbell London South Bank University
Pseudocode
Simple explanation of the steps to achieve a task
Can be reduced to
Sequence
Selection
Iteration
Step follows step
Choose which steps to follow depending on some condition
Repeat steps a number of times
Phil Campbell London South Bank University

3. Phil Campbell London South Bank University
Sequence
begin
wake up
get out of bed
shower
dress
eat
end
begin
wake up
get out of bed
//shower
go to bathroom
take shower
towel dry
dress
eat
end
The order is important
All steps must be done
Each step may be expanded
Phil Campbell London South Bank University

4. Phil Campbell London South Bank University
Selection
begin
if hungry
then
eat breakfast
end if
end
begin
if hungry
then
eat breakfast
else
drink coffee
end if
end
hungry is either true or false
hungry is a boolean condition
Must either eat breakfast or drink coffee but not both.
Phil Campbell London South Bank University

5. Phil Campbell London South Bank University
Selection
begin
if hungry
then
eat breakfast
else
drink coffee
end if
end
begin
if hungry=true
then
eat breakfast
else
drink coffee
end if
end
hungry is either true or false
hungry is a boolean condition
Phil Campbell London South Bank University

6. Phil Campbell London South Bank University
Selection
begin
if hungry
then
eat breakfast
else
drink coffee
end if
end
begin
if hungry=false
then
eat breakfast
else
drink coffee
end if
end
hungry is either true or false
hungry is a boolean condition
Phil Campbell London South Bank University

7. Phil Campbell London South Bank University
Selection
begin
select preference
case cereal: check milk in fridge
case sausages : get frying pan
case eggs : check use by date
case toast: open bread bin
end select
end
One and only one of the preferred actions will take place.
Phil Campbell London South Bank University

8. Phil Campbell London South Bank University
Iteration
begin
while hungry
eat
end while
end
As long as the hungry condition is true keep eating
begin
make toast
for each slice of toast
spread butter
eat
end for
end
Phil Campbell London South Bank University

9. Phil Campbell London South Bank University
Iteration
begin
move forward
...
end
begin
while can move forward
move forward
end while
end
Phil Campbell London South Bank University

10. Phil Campbell London South Bank University
Storing Values
begin
total <- 0;
for each student
add one to total
end for
display " value is " total;
end
increment total
total++
total <- total + 1
Count the number of students
Phil Campbell London South Bank University

11. Phil Campbell London South Bank University
Storing Values
begin
totalHeight <- 0;
count <- 0
for each student
add student height to totalHeight
increment count
end for
result <- totalHeight / count
display "result is " result
end
Phil Campbell London South Bank University

12. Phil Campbell London South Bank University
begin
totalHeight <- 0;
count <- 0
for each student
add student height to totalHeight
increment count
end for
result <- totalHeight / count
display "result is " result
end
1.74
1.89
1.62
Student Heights
totalHeight
5.25
3.63
1.74
count 3 2 1
1.75
result
Result is 1.75
find the average height of a set of students
Phil Campbell London South Bank University

13. Phil Campbell London South Bank University
UML Activity Diagram
wake up
get out of bed
shower
dress
eat
begin
wake up
get out of bed
shower
dress
eat
end
Phil Campbell London South Bank University

14. Phil Campbell London South Bank University
UML Activity Diagram
[not hungry]
eat breakfast
[hungry]
begin
if hungry
then
eat breakfast
end if
end
Phil Campbell London South Bank University

15. Phil Campbell London South Bank University
UML Activity Diagram
eat breakfast
drink coffee
[hungry]
[not hungry]
begin
if hungry
then
eat breakfast
else
drink coffee
end if
end
Phil Campbell London South Bank University

16. Phil Campbell London South Bank University
UML Activity Diagram
eat
[hungry]
[not hungry]
begin
while hungry
eat
end while
end
Phil Campbell London South Bank University

17. Answer to robot (general)
begin
while not at target
turn left
while not can move
turn right
end while
move forward
end
Phil Campbell London South Bank University

18. Phil Campbell London South Bank University
Robot class
Phil Campbell London South Bank University