Introduction to flowchart

1. I/O,Process,
Control &
Flowchart
INTRODUCTION (PART 1)

2. Lesson
Objectives
To enable students to understand :-
Control Technology
The term Input, Process and Output
Flowchart symbols

3. Control Technology
A control technology
Used everyday – control and monitors specific
things
Based on
Input Process Output
Example : Washing machine, electric kettle

4. Input
How the
system
starts, stops
or changes
Process
Computer
will carry out
the
instructions
Output
Result of the
instructions

5. Example : You have to press a
button to open the train door
Input : Button is pressed
Process : Instruction send to the control
Output : Door opens

6. What is a Flowchart?
A flowchart is a diagram that
represents a set of instructions.
1
Flowcharts normally use
standard symbols to represent
the different types of
instructions.
2

7. Flowchart Symbols
Start/Stop Input/output
Process Decision
Direction of flow Connector

8. Flow chart Question :
1. Students were asked to input their answers for the question
“ Which is the best subject?”
2. If their answer = “Computer Science”, then the system will
display “Of course it is!”
3. Else, it will display output “Try Again!” and go back to Step 1

9. Flowchart
Example

10. Exercise 1
Create a flowchart that will determine if car’s
headlights are ON.
If they are ON, then do nothing. If they are OFF,
then turn them ON.

11. Exercise 2
A student whose average marks is above 75 is awarded a star.
Fill in the following phrases in the flowchart for finding if a student gets a
star or not.
• Yes
• No
• Award a star
• Do better to get a star
• Is average greater than 75

12. THE END