Thread: Help with Tic Tac Toe with AI

I'm having trouble making the AI work. I would like to have the AI be competitive and make you think on where to go. The AI code starts at aimove, right now the AI just goes into the corners if the center square is taken. If the center square is not taken it would take it then go to the corners. The AI needs to go anywhere after the player moves. X=88, O=79 using ascii table. Sometimes the X's turn into a ? where you did not go to. If you guys/gals can give any tips or help it will be appreciated.

Code:

# include <iostream>
# include <cstdlib>
# include <ctime>
using namespace std;
///////////////////////////////////////////////////////////////////////
int printboard(char board[3][3])
{
    int X,Y;
    char cyan[] = { 0x1b, '[', '0', ';', '3', '6', 'm', 0 };
    char normal[] = { 0x1b, '[', '0', ';', '3', '9', 'm', 0 };
    system("clear");
    for (Y=0;Y<3;Y++)
    {
        for (X=0;X<3;X++)
        {
            cout<<" "<<board[X][Y];
            if (X<2) cout<<cyan<<"║"<<normal;
        }
        cout<<"\n";
        if (Y<2) cout<<cyan<<"══╬══╬══\n"<<normal;
    }
    return 0;
}
///////////////////////////////////////////////////////////////////////
int initboard(char board[3][3])
{
    int X,Y;
    for (Y=0;Y<3;Y++)
        for (X=0;X<3;X++)
            board[X][Y]=X+1+Y*3+48;
    return 0;
}
///////////////////////////////////////////////////////////////////////
int playermove(char board[3][3])
{
    int X,Y,Z,VALID;
    do
    {
        cout<<"Where do You want to place Your X? ";
        cin>>Z;
        VALID=1;
        for (Y=0;Y<3;Y++)
            for (X=0;X<3;X++)
                if(board[X][Y]==(Z+48))
                {
                    board[X][Y]=88;
                    VALID=1;
                }
    }while (!VALID);
    return 0;
}
///////////////////////////////////////////////////////////////////////
int checkforwin(char board[3][3])
{
    int X,Y,CAT=-1;
    for (Y=0;Y<3;Y++)    //Did X win vertically
        if ((board[0][Y]+board[1][Y]+board[2][Y])==264) return 1;
    for (X=0;X<3;X++)    //Did X win Horizontally
        if ((board[X][0]+board[X][1]+board[X][2])==264) return 1;
        if ((board[0][0]+board[1][1]+board[2][2])==264) return 1;    //Did X win Diagonal1
        if ((board[2][0]+board[1][1]+board[0][2])==264) return 1;    //Did X win Diagonal2


    for (Y=0;Y<3;Y++)    //Did O win vertically
        if ((board[0][Y]+board[1][Y]+board[2][Y])==237) return 2;
    for (X=0;X<3;X++)    //Did O win Horizontally
        if ((board[X][0]+board[X][1]+board[X][2])==237) return 2;
        if ((board[0][0]+board[1][1]+board[2][2])==237) return 2;    //Did O win Diagonal1
        if ((board[2][0]+board[1][1]+board[0][2])==237) return 2;    //Did O win Diagonal2
        
    for (Y=0;Y<3;Y++)    //If board is full
        for (X=0;X<3;X++)
            if ((board[X][Y]!=88)&&(board[X][Y]!=79))    CAT=0;
    return CAT;
}
///////////////////////////////////////////////////////////////////////
int aimove(char board[3][3])
{
    srand(time(NULL));
    int randX,randY,X,Y;
    if (board[1][1]<79)        //If center square is not taken, take it
    {
        board[1][1]=79;
        return 0;
    }
    if (board[1][1]==88)        //If center square is taken, move somewhere else
        {
            randX=rand()%2*2;
            randY=rand()%2*2;
            board[randX][randY]=79;
            return 0;
        }
    for (Y=0;Y<3;Y++)        //Looks for Horizontal block
        for (X=0;X<3;X++)
        {
            if ((board[X][Y])+(board[X+1][Y]=176)) board[X+2][Y]=79;
            cout<<board[X][Y]<<board[X+1][Y]<<board[X+2][Y]<<"\n";
            return 1;
        }
    for (Y=0;Y<3;Y++)        //Looks for Vertical block
        for (X=0;X<3;X++)
        {
            if ((board[X][Y])+(board[X][Y+1]=176)) board[X][Y+2]=79;
            return 1;
        }
    do
    {
        randX=rand()%3;
        randY=rand()%3;
        //cout<<"("<<randX<<","<<randY<<")\n";
    }while (!(board[randX][randY]<79));
        board[randX][randY]=79;
            /*if ((board[X][Y]!=88)&&(board[X][Y]!=79))
            {
                randX=rand()%2;
                randY=rand()%2;
                board[randX][randY]=79;    
            }*/
    return 0;
}
///////////////////////////////////////////////////////////////////////
int main()
{
    char board[3][3];            //Declare Variables
    //system("espeak -s 130 'Herro I am TicTacToe'");
    initboard(board);
    do
    {
        printboard(board);
        playermove(board);
        printboard(board);
        if (!checkforwin(board)) aimove(board);
    }while (!checkforwin(board));
    if (checkforwin(board)==1) cout<<"Player Wins";
    //if (checkforwin(board)==1) system("espeak -p 30 'Player Wins'");
    if (checkforwin(board)==2) cout<<"AI Wins";
    //if (checkforwin(board)==2) system("espeak -p 60 'AI Wins'");
    if (checkforwin(board)==-1) cout<<"CAT - It's a tie";
    //if (checkforwin(board)==-1) system("espeak -p 70 'MEOW!'");
    return 0;
}

This line should be in the main function.

Code:

srand(time(NULL));

Tim S.

Originally Posted by Gage_Hadley

X=88, O=79 using ascii table.

Not relevant: use 'X' and 'O' instead of these magic numbers. Likewise, use '0' instead of 48 (especially since the digits are guaranteed to be contiguous in value, so adding 1 to 9 to '0' is guaranteed to result in '1' to '9' respectively).