Algorithm & Flowchart

1. C Programming
Algorithm and Flowchart

2. Algorithm
Algorithm refers to a set of
rules/instructions that step-by-step
define how a work is to be executed in
order to get the expected results.

3. Finding average marks of 3 subjects
of the student.
BEGIN
Step 1: Accept 3 marks say M1, M2, M3 scored by the
student.
Step 2: Add M1, M2, M3 and store the result in Total.
Step 3: Divide Total by 3 and find the Average.
Step 4: Display Average
END

4. Finding area of circle
BEGIN
Step 1: Accept the R.
Step 2: Find the square of radius and store it in R,
R=R*R
Step 3: Multiply R with 3.14 and store the result in A.
END

5. Flowchart
Flowchart is a pictorial presentation of
the facts presented in algorithm. It helps
to reach ease of reading the algorithm
since it makes use of symbolic shapes.

6. Flowchart Symbol
Terminal: The symbol indicates beginning, end and
pause(halt) program’s logic flow.
Input / output: The symbol indicate input, output data
from/to keyboard, mouse monitor, data files etc.
Processing: This symbol indicate arithmetic
processing and data movement instruction.
Decision: This symbol indicates a decision point,
appoint at which a branch of two or more alternative
points are possible.
Flow lines: This symbol indicates flow of operation.

7. Flow chart for calculating average marks of 3 subjects of the student.
START
Display AVG
Calculate Total =
M1+M2+M3
Calculate AVG = Total/3
Accept marks ,
M1, M2 , M3
END

8. Flow chart for calculating area of a circle
START
Calculate R = R*R
Calculate A= 3.14*R
Enter value for
R
END

9. Flow chart to print the largest of three numbers.
START
Read A,B, C
Is
A>B
?
Is
A>C
?
Is
B>C
?
Yes
Yes
Print A
No Yes
Print B
Print C
No
END

10. THANK YOU