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Optimization Strategies and FSM Implementation

Learn key points about optimization priorities and FSM implementation, along with a vending machine example and tree data structure details. Enhance algorithms, focus on executing code efficiently, and organize conditionals in an FSM.

silas-bradshaw
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Optimization Strategies and FSM Implementation

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  1. CS 498 (242) Lecture 3

  2. Last Lecture • Made too many assumptions • Was too broad • Did not cover timing in enough detail to be useful • Did not cover important parts of optimization in enough detail

  3. Important Points • Optimization priorities: • Improve the algorithm if you can • Concentrate your effort on the code that is executed most (it was obvious in last assignment) • Eliminate unnecessary instructions (things that don’t change from one iteration to next) • Order conditionals so those most likely to fail come first

  4. FSM • Example - Vending machine • Accepts nickels only • $0.15 dispense product

  5. Pseudo-code While machine on inputTotal = 0 While (inputTotal < PRODUCT_PRICE) inputTotal += AcceptCoin(coin) DispenseProduct

  6. AcceptCoin(coin) • Is it a nickel? • Yes – return(5) • RejectCoin(coin) • Return(0)

  7. AcceptCoin(coin) • Is it a nickel? • Yes – return(5) • Is it a dime? • Yes – return(10) • Is it a quarter? • Yes – return(25) • RejectCoin(coin) • Return(0)

  8. Outline Introduction I have a couple of points to make Topic 1 key point 1 first detail of my first point second detail of my first point second key point Conclusion

  9. Tree Data Structure • Root node (outline) • Children: • Introduction • Topic(s) • Conclusion

  10. Tree Data Structure • Topic(s) • Key point(s) • Detail(s)

  11. Tree Data Structure • Key point(s) • Detail(s)

  12. Example <outline> <outlinename>My Outline</outlinename> <introduction>I have a couple of points to make</introduction> <topic> <topicname>Topic 1</topicname> <keypoint> <keypointtitle>key point 1(/keypointtitle> <detail>first detail of my first point</detail> <detail>second detail of my first point</detail> </keypoint> <keypoint><keypointtitle>second key point</keypointtitle> </keypoint> </topic> </outline>

  13. How is this a tree?

  14. What are the nodes?

  15. What signals you to start a state?

  16. What signals you to start a state? • A tag • Example - <topic>

  17. What signals you to exit a state?

  18. What signals you to exit a state? • Matching end tag • Example - </topic>

  19. <topic> • Get next tag • Is it: • Topicname • Keypoint • </topic> We don’t worry if it’s a “<conclusion>” or anything else. Those are not valid inputs to transition states.

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