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     Faculty of Applied Science and Engineering, University of Toronto
               CSC181: Introduction to Computer Programming, Fall 2000

Tutorial Notes, Week 10
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Summary of Topics
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- Modules

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Introduction
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Consider the game of Scrabble. How would you decompose this game into
modules?

Here's a possible breakdown: Game, Board, Player and Tray.

----
Game
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Data:

- A Board.

- A set of n Players, where n can be a number from 1 to 4.

- A bag of tiles.

Operations:

- initialize(n): Initializes this game for n players, where n can be a
  number from 1 to 4.

- start(): Starts the game.

- dispense(n, p): Dispenses n tiles to player p.

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Board
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Data:

- A grid of squares, each of which may contain one tile.

Operations:

- initialize(): Initializes this board to an empty board.

- place(l, p, o): Places the sequence of letters l at position p with
  orientation o. Returns the score for this move.

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Player
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Data:

- A score.

- A Tray of tiles.

Operation:

- move(l, b, p, o): Places the sequence of letters l on Board b at
  position p with orientation o. The letters in l are removed from
  this player's tray of tiles, and replaced by letters which this
  player takes from the bag. The score for the move is added to this
  player's score.

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Tray
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Data:

- A set of n tiles, where n is a number from 0 to 7.

Operations:

- add(t): Adds tile t to this tray.

- remove(t): Removes tile t from this tray.