1. Algorithm & Flow Charts
Presented By Manesh T Course:1090 CS

2. ALGORITHMS AND FLOWCHARTS
Step by step method to solve a problem is algorithm
Flow Chart
Diagrammatic representation of algorithm

3. Algorithm
Example 1:
Write an algorithm to Add two numbers

4. Problem: Add two numbers
Step 1: Start Step 2: Read A, B Step 3: C=A+B Step 4: Print C Step 5: Stop

5. Algorithm Problem: Subtract 2 numbers Problem: Multiply 2 numbers
Step 1: Start Step 2: Read A, B Step 3: C=A*B Step 4: Print C Step 5: Stop
Step 1: Start Step 2: Read A, B Step 3: C=A-B Step 4: Print C Step 5: Stop

6. Algorithm Problem: Average of 3 numbers
Step 1: Start Step 2: Read A, B, C Step 3: Avg=(A+B+C)/3 Step 4: Print Avg Step 5: Stop

7. Algorithm Problem: Find your Age
Step 1: Start Step 2: Read Byear Step 3: Age=2015-Byear Step 4: Print Age Step 5: Stop

8. Algorithm Problem: Area of Circle
Step 1: Start
Step 2: Read Radius
Step 3: Area=3.14*Radius *Radius
Step 4: Print Area
Step 5: Stop

9. Algorithm Problem: Find even or odd
Step 1: Start Step 2: Read N Step 3: Is (N%2=0) then Print “Even” else Print “Odd” Step 4: Stop

10. Algorithm Problem: Find Pass or Fail
Detailed Algorithm
Step 1: Start
Step 2: Read M1,M2,M3,M4
Step 3: GRADE  M1+M2+M3+M4
Step 4: Is (GRADE < 60) then
Print “FAIL”
else
Print “PASS”
Step 5: Stop

11. The Flowchart A Flowchart is another algorithm but graphical.
shows logic solution
emphasizes individual steps and their interconnections
A flowchart must have a start and stop
A steps in a flowchart must connect.

12. Flowchart Symbols
General Used Symbols

13. Flow Chart: Add Two Numbers
Algorithm
Start
Flowchart
Read A, B
C=A+B
Print C
Stop

14. DECISION STRUCTURES The expression A>B is a logical expression
it describes a condition we want to test
if A>B is true (if A is greater than B) we take the action on left
print the value of A
if A>B is false (if A is not greater than B) we take the action on right
print the value of B

15. DECISION STRUCTURES is
A>B Y N
Print A
Print B

16. Flow Chart: Find Even or Odd
Start
Read N Is
N%2=0 Y N
Print “Odd”
Print “Even”
Stop

17. Flow Chart: Find Largest of two numbers
Start
Read A, B Is
A>B Y N
Print “B is large”
Print “A is large”
Stop

18. Problem: Write Algorithm and Flowchart to find solution of Quadratic equation
START
Read
a, b, c
d  sqrt(b x b – 4 x a x c)
STOP
x1 (–b + d) / (2 x a)
X2  (–b – d) / (2 x a)
Algorithm:
Step 1: Start
Step 2: Read a, b, c
Step 3: d  sqrt ( )
Step 4: x1  (–b + d) / (2 x a)
Step 5: x2  (–b – d) / (2 x a)
Step 6: Print x1, x2
Step 7: Stop
Print X1, X2

19. Assignment 1 Draw algorithm and flowchart
Find area of triangle (area=(1/2)*breadth*height)
Convert Celsius to Fahrenheit temperature f = (1.8*c) + 32;
Volume of cylinder(V= 3.14*R*R*Height)
Find volume of sphere (4/3* 3.14*R*R*R)
Find biggest of three numbers.

20. Instructions to students
Study definition well
Study different algorithms well
Study how to draw flowchart for specific problems.
Workout various assignment problems
Approach me for any doubt clarifications

21. Control Statements
Decision Making &
Branching
Decision Making &
Looping
If Statement
Switch
ConditionalStatement
For loop
While loop
Do while loop
Jump
Break
Continue
Simple If
If else
Nested if else
If else ladder