TicTacToe - Game Design

Before writing the interface functions to support two-player Tic Tac Toe, we need to specify the variables used to control the game.

One new data type is declared: PlayerType. Player type can have the following values: X, O, and PNONE. PlayerType is used in the game board.

The following variables are used in our two-player Tic Tac Toe game:

Together, these variables define the game state.
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