what is flowchart?Its symbols,Guidelines and examples

1. Flow Chart
1. Introduction
2. Why needed
3. Symbols
4. Guidelines
5. Benefits
6. Limitations
7. Examples

2. A picture is worth a thousand words....

3. 1:Introduction
• A pictorial representation of an algorithm is called a ‘Flowchart’.
• The steps in the algorithm are represented in the form of :
• Different shapes of boxes
• Logical flow is indicated by interconnecting arrows.
• The boxes are used to represent different operations.
• The arrows are used to represent the sequence of these operations.
• Since this is a visual way of algorithm representation, it helps the
programmer/tester in understanding the logic of the program.
• Also known as block diagrams, system charts, procedural chart and logic
diagram.

4. 2:Why needed
• It's more effective to visualize graphically than to describe with
• words.
• That is the essence(nature , core) of what flow charts do.
• Flow charts explain a process clearly through symbols and text.
• Flow charts give you the gist(core, heart) of the process flow in a
single glance.

5. 3:Symbols:
• Following are some symbols
used in flowchart:

6. Contd:

7. Contd:

8. 4:Guidelines:
1. Should be neat and easy to follow.
2. A logical start and end must be given to it.
3. Should include necessary steps in logical order.
4. Only one flow line should come out from a process symbol.

9. Contd:
5. Decision making symbol should
have only one incoming flow line.
It may have two or three out-
going flow lines.
6. terminal symbols(Start ,
Stop/End) should have only one
flow line.

10. Contd:
7. The symbol should contain the information(process, data or text).
8. The number of flow-lines can be reduced using connector symbol.
The connectors are mainly required in complex flowcharts.
9. The intersected flow-lines should be avoided.
10. The correctness of the flowchart can be tested by passing the test
data through it.
11. It becomes the validity test of the flowchart.

11. 5:Benefits:
• Logic of the problem can be understood easily.
• Makes the communication easier to all the involved people.
• Analysis of the problem becomes effective and easier.
• Allow the programmer to develop error free programs.
• Allows the testing of program in every contingency(event).
• Serve as good documentation tool for beginners.

12. 6:Limitations:
• Not efficient for complex programs.
• Costly for large programs.
• Difficult to modify
• No updation.

13. 7:Example:
Online order system.

14. No
Yes
No
Yes
Start
Take phone order
Process Credit Card
Process Address
card
ok?
Contact for Correction
Contact Customer
address
ok?
Print Invoice End

15. Another Example:
Alarm System.

16. No
Yes
Start
Alarm Rings
Ready
to GET
UP?
Hit Snooze Button Set Delay Time
Climb Out Of Bed
End

17. References:
• http://mundrisoft.com/tech-bytes/flowchart-in-software-
engineering-testing/
• https://whatis.techtarget.com/definition/flowchart
• https://www.smartdraw.com/flowchart/
• https://www.youtube.com/watch?v=4I8xpRdBjMw