1. Developing logic (Examples on algorithm and flowchart)
CS-101
Lecture 10
Algorithm and Flow Chart
Developing logic (Examples on algorithm and flowchart)
Department of Computer Science
College of Arts and Science 1

2. Relational Operator Operator Description > Greater than <
Smaller than ≤
Smaller than or Equal ≥
Greater than or Equal =
Equal ≠
Not Equal 2

3. If else structure The structure is as follows If condition then
true alternative
else
false alternative
endif 3

4. If else structure is
A>B
Print B
Print A Y N
Print A
Print B 4

5. Example (1)
Step 1: Start. Step 2: Input M1,M2,M3,M4 Step 3: GRADE  (M1+M2+M3+M4)/4 Step 4: if (GRADE < 60) then Print “FAIL” else Print “PASS” endif 5

6. Example (2) Write a algorithm to find out number is odd or even?
step 1 : start
step 2 : input number
step 3 : rem=number mod 2
step 4 : if rem=0 then
               print "number even"
           else
               print "number odd"
           endif
step 5 : stop
Mr.Mohammed Rahmath

7. Chapter 2- Visual Basic Schneider
What is a flowchart?
Diagram that visually represents the steps that the program performs to arrive at a solution.
A popular logic tool used for showing an algorithm in graphical form.
Name: Flowlinee: Used to connect symbols and indicate the flow of logic
Terminal: Used to represent the beginning or the end of task
Input/output: Used for input and output operations, such as reading and printing.
Processing: Used for arithmetic and data manipulation operations
Decision: Used for any logic or comparison operations. Unlike the two other symbols , which have one entry and one exit flowline, the decision symbol has one entry and two exit paths.
Chapter 2- Visual Basic Schneider

8. Chapter 2- Visual Basic Schneider
Continue flowchart
Programmer draws flowchart before coding.
Most common flowchart symbols are:
Flowline: indicates flow of logic. (arrow )
Terminal: represents beginning or end of task (oval )
Input/Output: represents input or output operations (parallelogram )
Processing: data manipulation operations (rectangle )
Decision: used for logic or comparison operation (diamond )
Chapter 2- Visual Basic Schneider

9. Chapter 2- Visual Basic Schneider
Start
Example of Flowchart:
Initialize counter
and sum to 0
Are there more data? No
Yes
Get next grade
This is a program to insert grades and calculate the average
Determine the average grade of a class
Increment counter
Add grade to sum
Average=sum/counter
Print the average
Chapter 2- Visual Basic Schneider
Finish

10. Cont.. PRINT “PASS” START Input M1,M2,M3,M4 GRADE(M1+M2+M3+M4)/4
“FAIL”
STOP Y N
Print “Pass”
Print “Fail” 10

11. Example (2)
Write an algorithm and draw a flowchart that will read the two sides of a rectangle and calculate its area.
Pseudocode
Input the width (W) and Length (L) of a rectangle
Calculate the area (A) by multiplying L with W
Print A 11

12. Thank you for your attention
Lecturer : Aasd Abd Elrashid