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Flow Charting

Flow Charting. Damian Gordon. Introduction.

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Flow Charting

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  1. Flow Charting Damian Gordon

  2. Introduction • We mentioned it already, that if we thing of an analyst as being analogous to an architect, and a developer as being analogous to a builder, then the most important thing we can do as analysts is to explain our designs to the developers in a simple and clear way. • How do architects do this?

  3. Flowcharts • So let’s say we want to express the following algorithm: • Read in a number and print it out.

  4. START

  5. START Read in A

  6. START Read in A Print A

  7. START Read in A Print A END

  8. Flowcharts • So let’s say we want to express the following algorithm: • Read in a number and print it out double the number.

  9. START

  10. START Read in A

  11. START Read in A Print A*2

  12. START Read in A Print A*2 END

  13. Or alternatively...

  14. START

  15. START Read in A

  16. START Read in A B = A*2

  17. START B = A * 2 can be read as “B gets the value of A multiplied by 2” Read in A B = A*2

  18. START Read in A B = A*2 Print B

  19. START Read in A B = A*2 Print B END

  20. Flowcharts • So let’s say we want to express the following algorithm: • Read in a number, check if it is odd or even.

  21. START

  22. START Read in A

  23. START Read in A Does A/2 give a remainder?

  24. START Read in A Does A/2 give a remainder? Print “It’s Odd” Yes

  25. START Read in A Does A/2 give a remainder? Print “It’s Odd” Print “It’s Even” No Yes

  26. START Read in A Does A/2 give a remainder? Print “It’s Odd” Print “It’s Even” No Yes END

  27. Flowcharts • So let’s say we want to express the following algorithm to print out the bigger of two numbers: • Read in two numbers, call them A and B. Is A is bigger than B, print out A, otherwise print out B.

  28. START

  29. START Read in A and B

  30. START Read in A and B A>B?

  31. START Read in A and B A>B? Print A Yes

  32. START Read in A and B A>B? Print A Print B No Yes

  33. START Read in A and B A>B? Print A Print B No Yes END

  34. Flowcharts • So let’s say we want to express the following algorithm to print out the bigger of three numbers: • Read in three numbers, call them A, B and C. • If A is bigger than B, then if A is bigger than C, print out A, otherwise print out C. • If B is bigger than A, then if B is bigger than C, print out B, otherwise print out C.

  35. START

  36. START Read in A, B and C

  37. START Read in A, B and C A>B?

  38. START Read in A, B and C A>C? A>B? Yes

  39. START Read in A, B and C A>C? A>B? B>C? No Yes

  40. START Read in A, B and C A>C? A>B? B>C? No Yes No No Print C

  41. START Read in A, B and C A>C? A>B? B>C? No Yes Yes No No Print A Print C

  42. START Read in A, B and C A>C? A>B? B>C? No Yes Yes Yes No No Print A Print C Print B

  43. START Read in A, B and C A>C? A>B? B>C? No Yes Yes Yes No No Print A Print C Print B END

  44. Flowcharts • So let’s say we want to express the following algorithm: • Print out the numbers from 1 to 5

  45. START

  46. START Print 1

  47. START Print 1 Print 2

  48. START Print 1 Print 2 Print 3

  49. START Print 1 Print 2 Print 3 Print 4

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