1. EE2372 Software Design with Flowcharts
Dr. Jose Gerardo Rosiles
Spring 2010
TTh 10:30-11:50 am

2. Flowcharts
Algorithm: A sequence or series of steps followed to solve a problem or to implement a solution to this problem.
A flowchart is a means of visually presenting the flow or steps taken to implement a computer program.
Flowcharts can be used to visualize algorithms.

3. Flowcharts Start and end program Processing steps
Input/Output operations
Decision making and branching
Connector
Flow lines
Graphical elements used to build flowcharts

4. Flowcharts How to link components 1 <0 START >0 DO SOMETHING 1
DECIDE
>0
DO SOMETHING 1
INPUT VALUE NO
==0
DECIDE
OUTPUT VALUE
DO SOMETHING
YES 1
END

5. Flowcharting Examples
Some examples taken from
See class handout for more details

6. Example 1
Draw a flowchart to find the sum of the first 50 natural numbers.

7. Example 2
Draw a flowchart to find the largest of three numbers A,B, and C.
Do on your own, then look at solution.
Find an error in the following possible solution

8. Example 3 Draw a flowchart for computing factorial N (N!) where

9. Example 4
A company’s salesmen are selling toothpaste and tooth powder. The company having 50 salesmen gives 10% commission on the sale of toothpaste and 20% commission on tooth powder.
Draw a flowchart to compute and print the total sale and the total commission for each salesman.  
Note:
S = Salesman number
P1 = Amount of sales of paste
P2 = Amount of sales of powder
K = Counter for the number of salesman

10. Example 5
Modify the flowchart in Example 4 to print the following heading.
Salesman No Total Sale Total commission
Under these heading, write the values of these variables for the 50 salesmen. At the end, the totals of the entire sale and the entire commission should also be printed out.
Hint, use variables:
TS = Total sales
TC = Total commission

11. Example 6
Implement a flowchart to compute

12. Example 7 How do hand calculators implement trigonometric functions?
Use approximations by Taylor series (thanks to Wikipedia for the math LaTex expressions).
Draw flowcharts to approximate cosine and sine up to N terms.
Assume you have access to power and factorial functions.