EE 2372 Software Design with Flowcharts Dr Jose

Flowcharts – Algorithm: A sequence or series of steps followed to solve a problem

Flowcharts • Graphical elements used to build flowcharts 1. Start and end program 1.

Flowcharts • How to link components 1 <0 START >0 INPUT VALUE DO SOMETHING

Flowcharting Examples • Some examples taken from http: //www. nos. org/htm/basic 2. htm •

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

Example 2 • Draw a flowchart to find the largest of three numbers A,

Example 3 • Draw a flowchart for computing factorial N (N!) where N! =

Example 4 • A company’s salesmen are selling toothpaste and tooth powder. The company

Example 5 • Modify the flowchart in Example 4 to print the following heading.

Example 6 • Implement a flowchart to compute

Example 7 • How do hand calculators implement trigonometric functions? • Use approximations by

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EE 2372 Software Design with Flowcharts Dr. Jose Gerardo Rosiles Spring 2010 TTh 10: 30 -11: 50 am

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.

Flowcharts • Graphical elements used to build flowcharts 1. Start and end program 1. Processing steps 1. Input/Output operations 1. Decision making and branching 1. Connector 1. Flow lines

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

Flowcharting Examples • Some examples taken from http: //www. nos. org/htm/basic 2. htm • See class handout for more details

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

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

Example 3 • Draw a flowchart for computing factorial N (N!) where N! = 1 2 3 …… N.

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 P 1 = Amount of sales of paste P 2 = Amount of sales of powder K = Counter for the number of salesman

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

Example 6 • Implement a flowchart to compute

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