Class 24: Objects and Classes and Go

cs1120: Introduction to Computing
Explorations in Language, Logic, and Machine
University of Virginia, Spring 2016

http://xplorecs.org/class24

Class 24:
Objects
Introducing Classes
Game-Playing Machines
Go

1. Class 24: Playing Games Introduction to Computing: Explorations in Language, Logic, and Machines cs1120 Spring 2016 David Evans University of Virginia
2. Plan Objects and Classes Project 5: Tic-Tac-Go! Wednesday: Sorting Algorithms (Yuchi)
3. Introducing Objects An object packages: – state (“instance variables”) – functions for manipulating that state (“methods”) Have you been using objects already?
4. Familiar Objects
5. Stringy Objects
6. Making Objects ClassDefinition ::= class Name: Definitions
7. Making Objects In Washington, it’s dog eat dog. In academia, it's exactly the opposite. Robert Reich
9. Making Objects with State
11. Objects and Classes An object packages: – state (“instance variables”) – functions for manipulating that state (“methods”) A class provides a way to make your own types of objects. Why is this a big deal?
12. Problem-Solving Strategies Project 1-4: Functional and Imperative Programming • Focused on functions • Break a problem into functions that can be composed to solve problem Project 5: “Object-Oriented Programming” • Focused on objects that package state and functions • Solve problem by designing classes that model the problem • Lots of problems can be thought of this way
13. Project 5: Tic-Tac-Go!
14. From the Break Survey http://xplorecs.org/breaksurvey
15. Alan Turing 1953
16. John McCarthy playing chess with IBM 7090 (1967)
17. Deep Blue beats Gary Kasparov (1997)
19. Go Primer
20. Go Primer
21. Go Rule #1: Liberty Rule of Liberty: if a stone is surrounded, it is removed Rule of Ko: cannot make a move that returns state to previous configuration Chinese rules: any previous configuration Japanese rules: immediatelyprevious
22. Go Rule #2: Repetition Rule of Ko: cannot make a move that returns state to previous configuration Chinese rules: any previous configuration Japanese rules: immediatelyprevious
23. Playing a Game while True: player 1 passes or places a Black stone player 2 passes or places a White stone if both passed: break winner is player with the most stones 0 1 2 3 0 1 2 3
24. Why so complex?
25. Actual board is 19x19
26. Actual board is 19x19
27. Alan Turing 1953
28. Alan Turing 1953
29. Alan Turing 1953
30. Charge Pre-Blue Belts: • Qualify for Blue Belt exam • Retake (new) Blue Belt exam Blue Belts: Start Project 5