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01-tic-tac-toe.md

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Tic Tac Toe

Problem Statement

Design a command-line based, 3x3 grid Tic Tac Toe game that can be played by 2-players.

Requirements

Board

3x3 grid board with the following naming convention for squares of the grid

A1    A2    A3
B1    B2    B3
C1    C2    C3

Players

Game has 2 players. Every player has a name and a character. The character is by default, “X” and “O” for player 1 and 2, but players can pick their own characters. Both players must not have the same character.

Game

  • Game starts with Player 1 inserting their character on one of the boxes
  • Players get alternative turns, and insert their characters on boxes
  • On every turn, take command line input of which box to place character
  • After every turn show state of game
  • After every turn, one of 4 conditions can happen
    • Player specifies wrong box (already has been used);
      In this case, same player will try again
    • Placing the character results in game winning condition (specified below);
      in this case end the game and declare winner
    • Player specifies correct box, but doesn’t win game;
      Give turn to other player and continue game
    • Board is full (this was last entry), and no winner;
      Declare game draw and end game
  • Winning conditions:
    Same character in all boxes of:
    • any row
    • Any column
    • Any diagonal

Data Format

Initialise Game & Players

Enter Player 1 Name: 
> John 
Enter Player 1 Character (X):
> ❎
Enter Player 2 Name:
> Jane 
Enter Player 2 Character (O):
> 🛑

Note: If player doesn’t enter character, default to X and O

Gameplay

Board: 
_  _  _
_  _  _
_  _  _

Player 1: Enter box: 
> A1 


Board: 
❎ _  _
_  _  _
_  _  _

Player 2: Enter box: 
> A2 

Board: 
❎ 🛑 _
_  _  _
_  _  _

Player 2: Enter box: 
>

Expectations

Minimum Requirements

  • Make sure that you have a working and demonstrable code
  • Make sure that the code is functionally correct
  • Code should be modular and readable
  • Separation of concern should be addressed
  • Please do not write everything in a single file (if not coding in C/C++)
  • Code should easily accommodate new requirements and minimal changes
  • There should be a main method from where the code could be easily testable
  • Write unit tests, wherever applicable
  • No need to create a GUI

Optional Requirements

Please do these only if you’ve time left. You can write your code such that these could be accommodated without changing your code much.

  • Keep the code extensible to change the size of the grid.
  • Keep the code extensible to allow different types of pieces.
  • Keep the code extensible to allow more than 2 players/piece types.