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Writing a computer program involves performing the following tasks. Understanding the problem

Solving a problem. Different steps in solving a problem. Writing a computer program involves performing the following tasks. Understanding the problem Developing an Algorithm for the problem Writing a Computer Program Testing the Computer program.

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Writing a computer program involves performing the following tasks. Understanding the problem

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  1. Solving a problem Different steps in solving a problem • Writing a computer program involves performing the following tasks. • Understanding the problem • Developing an Algorithm for the problem • Writing a Computer Program • Testing the Computer program IT Department - National Institute of Education

  2. Lets take a problem and try to solve the problem Problem : Add two numbers and display total. IT Department - National Institute of Education

  3. STEP 1 – Understand the problem How do you solve that problem ? The first task is to understand the problem clearly Find out the inputs ? Here the input should be two numbers. IT Department - National Institute of Education

  4. Find outputs ? Total. So there must be some calculation to get the total. That is Process. IT Department - National Institute of Education

  5. STEP 2 – Developing an Algorithm for the problem The method that used to solve the problem is called algorithm Algorithm can be represented in two ways 1.Graphically 2. Textually IT Department - National Institute of Education

  6. A Graphical representation of making a cup of tea Start Boilwater Put tea powder to mug Add some sugar Serve This Representation is called as Flow Chart Stop End Show IT Department - National Institute of Education

  7. Flowchart A graphical representation of the sequence of operations in a program is called Flow Chart. flowchart shows how data flows and operates IT Department - National Institute of Education

  8. Symbols used in Flow chart Process Start/Stop Decision Yes No Input/Output Flow line IT Department - National Institute of Education

  9. A Graphical representation to add two numbers Start Input two numbers Calculate total Display total Stop This Representation is called as Flow Chart End Show IT Department - National Institute of Education

  10. Stop Start Input Age Adult child Draw a flow chart to find adult or child. Yes No Ifage>=18 IT Department - National Institute of Education

  11. Start Stop Draw a flow chart to cross the road. Go to pavement Look at left & right Yes No Are clear both ways? Cross the road Wait IT Department - National Institute of Education

  12. Draw a flow chart to find the correct key from a bunch keys to open the door. Start Tryout a key Can the door be opened Yes No Try the next key Stop IT Department - National Institute of Education

  13. Problem Solving 1 Input name, Maths and Science marks and calculate Total. Display Name & Total Marks . Solve & design the above problem in Flow chart. IT Department - National Institute of Education

  14. Conti.. Start Input Name, Maths Mks , Science Mks Total= Maths + Science Display Name,Total Stop End Show IT Department - National Institute of Education

  15. Problem Solving 2 Draw Flow chat to input Average Marks and display Pass or fail (If Average>= 60 , “Pass” otherwise “Fail”) IT Department - National Institute of Education

  16. Start InputAverage IfAvg>=60 No Yes FAIL PASS Display Grade Stop IT Department - National Institute of Education

  17. Problem Solving 3 Draw a flow chart to input Average Marks and find the grade according to the grade System given below. 75 - 100 “A” 65 - 74 “B” 55 - 64 “C” 45 - 54 “S” 0 - 44 “F” IT Department - National Institute of Education

  18. Input Avg Stop Start Yes If Avg>=75 Display A No Yes Display B If Avg>=65 No Yes If Avg>=55 Display C No Yes Display S If Avg>=45 No Display F IT Department - National Institute of Education

  19. Draw a flow chart to print numbers from1 to 10 Start Number=1 No Is Number < =10 Number=Number+1 Yes Print Number Stop IT Department - National Institute of Education

  20. Pseudo Code One of the textual representation of algorithm is Pseudo code. IT Department - National Institute of Education

  21. Pseudo Code for adding two numbers Begin Input first number and second number Total = first Number + Second Number output Total End. IT Department - National Institute of Education

  22. Write a pseudo code to take maths and science marks , calculate total, average and display grade. (If average >=60, “Pass” otherwise “Fail”. Begin Input Maths Marks ,Science Marks Total = Maths + Science Average = Total / 2 If Average >= 60 then Grade= “PASS” Else Grade= “FAIL” End if Display Total , Average , Grade End IT Department - National Institute of Education

  23. Write a pseudo code to input Average Marks and find the grade according to the grade System given below. 75 - 100 “A” 65 - 74 “B” 55 - 64 “C” 45 - 54 “S” 0 - 44 “F” IT Department - National Institute of Education

  24. Begin Input Avg Mks If Avg >=75 then Grade = “A” Else If Avg >=65 then Grade =“ B” Else If Avg >=55 then Grade = “C” Else If Avg >= 45 then Grade =“ S” Else Grade = “W” End if End if End if End if Display Grade End IT Department - National Institute of Education

  25. Write a Pseudo code to display numbers from 1 to 10 Begin Number=1 Do While Number <=10 Print Number Number=Number + 1 End while End IT Department - National Institute of Education

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