อันนี้เป็น code เกี่ยวกับเกม XO

ทีนี้พยายามจะทำความเข้าใจกับเจ้าโค้ดพวกนี้แต่ยังมีจุดที่ยังสงสัยอยู่

พอจะช่วยหน่อยได้ไหมค่ะ T^T

[code] #include<iostream>
using namespace std;
int main()

{
    int i,j,k,row,column;
    char board[3][3];
    char notPlay = ' ';
    char aPlay = 'O';
    char bPlay = 'X';
    int currentPlayer = 1;  // PlayerA = 1, PlayerB = 2
    bool invalidPlay = true;
    int gameStatus = 0;     // Draw = 0, PlayerA win = 1, Player B win = 2

    // clear board
    for(i=0;i<3;i++)
    {
        for(j=0;j<3;j++)
        {
            board[j]=notPlay;
        }
    }
    // play game

    for(i=1;i<10;i++)
    {
        cout << "==================================================="< cout <<endl;
        cout<<"                    Round = "<<i<<endl;
    // display board
        cout<<"                      C0 C1 C2 "<<endl;

        for(j=0;j<3;j++)
        {
            cout<<"                    R"<<j;
            for(k=0;k<3;k++)
            {
                cout<<"["<< board[j][k]<<"]";
            }
            cout << endl;
        }

        // check game status
        if(gameStatus!=0)
        {
            break;
        }

        // read input
        if(currentPlayer==1)
        {
            cout<<"Player A"<<endl;
        }
        else
        {
            cout<<"Player B"<<endl;
        }
        while(invalidPlay) // duplicate check
        {
            cout<<"Select row(0-2) and column(0-2) seperate by space: ";
            cin>>row>>column;
            if (board[row][column]==notPlay) // valid play
            {
                if(currentPlayer==1) // player A
                {
                    board[row][column]=aPlay;
                }
                else
                {
                    board[row][column]=bPlay;
                }
            invalidPlay = false;
            }
        }

        // find the winner and set game status
        for(j=0;j<3;j++)
        {
        // check row
            if(board[j][0]==board[j][1]&&board[j][1]==board[j][2]&&board[j][0]!=notPlay)
            {
                gameStatus=currentPlayer;
            }

        // check column
            if(board[0][j]==board[1][j]&&board[1][j]==board[2][j]&&board[0][j]!=notPlay)
            {
                gameStatus=currentPlayer;
            }
        }

        // check cross line
        if(board[0][0]==board[1][1]&&board[1][1]==board[2][2]&&board[0][0]!=notPlay)
        {
            gameStatus=currentPlayer;
        }
        if(board[0][2]==board[1][1]&&board[1][1]==board[2][0]&&board[0][2]!=notPlay)
        {
            gameStatus=currentPlayer;
        }

        invalidPlay=true; // reset variable for next input
                            // switch player for next turn
        if(currentPlayer==1)
        {
            currentPlayer=2;
        }
        else
        {
            currentPlayer=1;
        }
    }

    //---------------------------------------------------------
    // display output
    //---------------------------------------------------------
    // display board
    cout<<"==================================================="<<endl;
    for(j=0;j<3;j++)
    {
        cout<<"*";
        for(k=0;k<3;k++)
        {
            cout<<"t"<<board[j][k];
        }
        cout<<endl;
    }
    if(gameStatus==0)
    {
        cout<<"Draw"<<endl;
    }
    else if(gameStatus==1)
    {
        cout<<"Player A wins"<<endl;
    }
    else
    {
        cout<<"Player B wins"<<endl;
    }
    return 0;
}
[/code]