Checking for a Win

In this lesson, the final version of the tic-tac-toe game will be implemented.

Requirements

after a player's move, determine whether they won
display a victory message Player {player name} won!!!
end the game

Checking if a player won

To win, a player must fill an entire row, column, or diagonal. Let's list all winning combinations:

first row
second row
third row
first column
second column
third column
first diagonal
second diagonal

Determining the function signature

The function should determine whether a player won, so the return value will be bool, and we'll call it CheckIsWin. To do its job, the function needs to know the player's name and see the board — these will be its parameters. The function body will check winning combinations. This gives us the signature bool CheckIsWin(string name, string[] board)


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bool CheckIsWin(string name, string[] board)
{
    string chr = name.Substring(0, 1);
    if ((board[0] == chr && board[1] == chr && board[2] == chr) || // first row
        (board[3] == chr && board[4] == chr && board[5] == chr) || // second row
        (board[6] == chr && board[7] == chr && board[8] == chr) || // third row
        // other winning combinations
        )
    {
        return true; // player won
    }
    return false; // player did not win
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Exercises

Complete the remaining winning combinations.


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After a player makes a move, check whether they won. If they did, print a message like Player {player name} won!!! and end the game (exit the loop). Implement this behavior.


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The game is ready! Play it. Does it work correctly? Do you like everything about it? You can always improve the program and make the computer work however you want.


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