Basic Flowcharting

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Goes through basic flowcharting symbol and their use in selection and repetition programming structures.

Goes through basic flowcharting symbol and their use in selection and repetition programming structures.

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Transcript

  • 1. Flowchart Algorithm Description
  • 2. Always begin with a BEGIN: There should be one begin and one end in each program: one way in, one way out. Subprograms have their own begin and end. Terminals (begin and end) should be horizontally central on the page. Don't forget to draw a line from the centre of the terminal. Begin
  • 3. You probably need to communicate with the user. Give the user instructions and accept input from the user with this symbol. Don't forget the line! Input / Output: Begin Input / Output
  • 4. Process: You can set the value of a variable or perform a calculation in a process. Begin Input / Output Process
  • 5. Example: a basic conversion algorithm The input / output symbol is used to show the user the results of the calculation. REMEMBER: one BEGIN and one END. You now have enough symbols to accept input, perform a calculation on it and display the result. Begin Cm = inches * 2.54 Get Inches Display cm End
  • 6. What about user choice? A diamond shape is used to show decisions... ?
  • 7. Selection allows the program to run different paths depending on a condition. The condition (question) resolves to TRUE or FALSE. True False Using Selection: Begin Display menu: 1. Inches to cm 2. cm to inches Get choice Choice = 1 End Convert cm Convert Inches
  • 8. Multi-way Selection: CASE statements allow different paths depending on the value of a testing variable.
  • 9. What about repetition? Repetition also involves a decision. To continue or not to continue... ?
  • 10. Guarded loops: If the condition is true, the loop executes. True False Note: the up line has an arrow! ?
  • 11. Unguarded loops: Note: the up line has an arrow! The loop executes until the condition is true. True False ?
  • 12. The End