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Algorithms and Flow Charts

Algorithms and Flow Charts. Algorithms. A procedure or formula for solving a problem. Drawing a square in Netlogo. Representation of Algorithms. Desirable Features Language independent Unambiguous Easy to understand A standard---understood and known by many Solution Flow charts.

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Algorithms and Flow Charts

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  1. Algorithms and Flow Charts

  2. Algorithms A procedure or formula for solving a problem. Drawing a square in Netlogo

  3. Representation of Algorithms Desirable Features Language independent Unambiguous Easy to understand A standard---understood and known by many Solution Flow charts

  4. Drawing a square As a flow chart:

  5. Using variables More general?

  6. Repetition

  7. Repetition in Netlogo On the previous slide while loop repeat ;; repeats forever pd loop [ fd 0.5 rt 1 ] ;; the turtle draws a circle pd repeat 36 [ fd 1 rt 10 ]

  8. Decision

  9. Decision if statement if else statement [ ifelse (xcor > 0) [ set color blue ] [ set color red ] ] [ if (xcor > 0) [ set color blue ] ]

  10. Procedures

  11. Input and Output

  12. Symbol Summary These seven symbols are used the most:

  13. The Bug Game • Implemented in Netlogo; here is the file • Objective: pick up all the food and return home in the fewest moves

  14. The Bug Game Write the procedure go using the following instructions (each instruction is actually a procedure call): turn-right turn-left move-forward dist (dist must be specified) pickup-food see-food (sets variables) see-start (sets variables) at-food (sets variables) at-start (sets variables)

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