1. C Programming Technique – Firdaus-Harun.com
Pseudocode

2. Agenda Intro to Pseudocode Pseudocode vs Flowchart
Technique – Write pseudocode
Examples

3. What’s Pseudocode ? Artificial and Informal language
Helps programmers to plan an algorithm
Similar to everyday English
Not an actual programming language

4. E.g : Pseudocode
Read A, B Calculate C = A*B Display C Stop

5. Technique Do not write Start in every pseudocode
Parallelogram – Read / Get OR Display / Print
Rectangle – Specify the actions
E.g:
Calculate A = B + C OR A equals to B plus C
Average = total / count
Final price equals price of item plus sales tax
Diamond – [Next »]

6. Technique (..Cont.) Diamond
Selection – IF , IF / ELSE and IF / ELSE IF
IF A is less than B
BIG = B
SMALL = A
ELSE
BIG = A
SMALL = B
Repetition – WHILE / DO/WHILE / FOR [Next example]

7. Comparative Between Flowchart vs Pseudocode
A graphical way of writing pseudocode
Rounded rectangle – terminal
Parallelogram – input / output
Rectangle – actions
Diamonds – decision / conditional
Circles – connector

8. E.g : Flowchart Process Output Start Terminal. Program start here
Input.
Enter values for
A and B
Process
Output
Stop Terminal
Program end
here

9. Comparative Between Flowchart vs Pseudocode (..Cont.)
No syntax rule – Independent from any programming language
Write in an ordinary language
Uses a structure resembling computer structure
No connector between pages

10. E.g : Pseudocode
Read A, B Calculate C = A*B Display C Stop

11. E.g : Pseudocode
Read A, B – Input Calculate C = A*B - Action Display C - Output Stop - Terminal

12. Example 2 (Selection) Read A, B BIG = B SMALL = A ELSE BIG = A
IF A is less than B
BIG = B
SMALL = A
ELSE
BIG = A
SMALL = B
Write / Display BIG, SMALL
Stop

13. Example 2 (Selection) Read A, B - Input BIG = B - Action
IF A is less than B - Selection
BIG = B - Action
SMALL = A - Action
ELSE - Selection
BIG = A - Action
SMALL = B - Action
Write / Display BIG, SMALL - Output
Stop - Terminal

14. Example 3 (Repetition)
Set count to zero Set total to zero Read number WHILE ( not end-of-data ) increment count by 1 total = total + number read number IF ( count > 0 ) then average = total / count Display average Stop

15. Advantages
Converting a pseudocode to a programming language is much more easier than converting a flowchart.
As compared to flowchart, it is easier to modify a pseudocode of a program logic when program modifications are necessary.

16. Limitations
In the cases of pseudocode, a graphic representation of program logic is not available.
There are no standard rules to follow for using a pseudocode.
Different programmers use their own style of writing pseudocode; and hence,
Communication problem occurs due to lack of standardization.

17. Class Tutorial *Using previous Flowchart tutorial.
Write a pseudocode to calculate Area and Perimeter of a trapezoid.
Write an algorithm to set a Median for given number : ………………………..