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Tic Tac Toe

Tic Tac Toe (aka "Noughts and Crosses") is a simple game played between two players on a 3x3 grid.

tic tac toe completed

In this project you will implement the game rules and a terminal-based UI.

We recommend that you implement this command-line, terminal UI project before starting the Tic Tac Toe (WWW) project.

(image source: Public Domain)

Wireframes

After launching the program and starting the game, the terminal should display this:

 1 | 2 | 3
--- --- ---
 4 | 5 | 6
--- --- ---
 7 | 8 | 9

Player X's turn
Move to?

After the user (acting as Player X) types 2 Enter, the board should redraw like this:

 1 | X | 3
--- --- ---
 4 | 5 | 6
--- --- ---
 7 | 8 | 9

Player O's turn
Move to?

Next, after the user (now acting as Player O) types 5 Enter, the board should redraw like this:

 1 | X | 3
--- --- ---
 4 | O | 6
--- --- ---
 7 | 8 | 9

Player X's turn
Move to?

Stories

No Rules

Given an empty board

And the current player is X

When the user selects a cell (e.g. typing 2 Enter)

Then the board redraws, and an X appears in that cell

And the turn ends, and the current player changes from X to O

And likewise for player O

Rules

When the user selects a cell that is not empty

Then the game says "That cell is already full. "

And the board state is unchanged (it does not put an X or O in the cell)

And the current player does not change

Win Condition

Given the turn has just ended

When there are three Xs in a row, column, or diagonal

Then the system draws a line through the winning three cells

And the app says "Congratulations! Player X wins!"

And the game ends

And likewise for Player O

Stalemate

Given all cells are full

And neither player has three in a row

When the turn ends

Then the app says "Stalemate!"

And the game ends

Names

When starting a game, choose the names of the players (not just X and O).

Then display the name of a player, and also say which symbol they are (X or O), e.g. Alice's turn (X)

Artificial Stupidity

Given a new game with the options "Player vs Player" or "Player vs Computer"

When "Player vs Computer" is chosen

Then do not ask for a name - The computer player always picks an empty cell at random - The human is always X and the computer is always O

Icebox

Artificial Intelligence