Algorithm and flowchart

Algorithm and flowchart

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  Algorithm and Flowchart 1 Presentedby: The Anonymous BSc.CSIT 1st semester
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  What is algorithm? Properties of algorithm What is flowchart ? Merits of flowchart Demerits of flowchart Algorithm and Flowchart in Coding References Queries 2
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  What is analgorithm ? Named after Persian mathematician Mohammad Al- Khwarizmi A sequential solution of any problem Written in human understandable form Requires a clear understanding of the problem 3
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  Example: 1. Algorithm forsum of two numbers Step 1: Start Step 2: Enter two numbers in a and b Step 3: Add a and b and store in c Step 4: Display c Step 5: End 4
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  2. Algorithm tocheck whether the input number is even or odd Step 1: Start Step 2: Enter a number in a Step 3: Check if it is even or odd Step 4: If even print “even” (a mod 2 = 0 ) Step 5: Else print “odd” Step 6: End 5
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  Properties of algorithm Finiteness Properlydefined Input Output Effectiveness Independent to any other programming language 6
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  7 Now moving onto next programming tool
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  What is flowchart? Diagrammaticrepresentation of algorithm An important programming tool Solving a problem using figures Different figures having different functions 8
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  Merits of flowchart •Easyto explain program logic •Makes coding effective and faster •Effective communication •Different symbols used •Serve as documentation •Easy to detect, locate and remove bugs in a program 9
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  Time consuming andmonotonous job Difficult to maintain Occupies space while documentation Translation to computer program is difficult 10
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  11 But what might bethe symbols used in flowchart?
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  Symbol Function Description Start/EndStart and end point Input/output Input and output operations Processing operation Editing and calculation of data Decision Check logical condition Connector Indicates logical flow from one page to another Direction of logic Direction of flow of logic Comment Indicates any comments for explanatory notes 12
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  Example 1: Flowchartadd sum of two numbers 13 START Input a and b C = a + b Display c END User can enter any two numbers
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  Example 2: Flowchartto check whether the input number is even or odd 14 START Accept a number Divide it by 2 END Is remainder = 0 ? Display odd Display even YesNo START Accept a number
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  15 Using Algorithm andFlowchart in Coding Coding Enter numbers in a and b: 5 6 Displayed c: 11
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  References: Websites: google.com wikipedia.com linkedin.com External sources: Text book:Fundamentals of computer programming 16
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  Queries 17