tictactoe.c

#include<stdio.h>
#include<conio.h>
#include<windows.h>
#include<stdlib.h>

char square[10]={'o','1','2','3','4','5','6','7','8','9'};
int checkWin();
void drawBoard();

int main()
{

    int player=1,i,choice;
    char mark;
    do
    {
        drawBoard();
        player=(player%2)?1:2;
        printf("Player %d, Enter the choice:",player);
        scanf("%d",&choice);
        mark=(player==1)?'X':'O';
        if(choice==1&&square[1]=='1')
            square[1]=mark;
        else if(choice==2&&square[2]=='2')
        square[2]=mark;
        else if(choice==3&&square[3]=='3')
        square[3]=mark;
        else if(choice==4&&square[4]=='4')
        square[4]=mark;
        else if(choice==5&&square[5]=='5')
        square[5]=mark;
        else if(choice==6&&square[6]=='6')
        square[6]=mark;
        else if(choice==7&&square[7]=='7')
        square[7]=mark;
        else if(choice==8&&square[8]=='8')
        square[8]=mark;
        else if(choice==9&&square[9]=='9')
        square[9]=mark;
        else
        {
            printf("Invalid position!");
            player--;

        }
        i=checkWin();
        player++;

    }while(i==-1);
    drawBoard();
    if(i==1)
    {
        printf("==>Player %d won!",--player);
    }
    else
    {
        printf("==>Game Draw!");

    }

    return 0;
}
int checkWin()
{
    if(square[1]==square[2] && square[2]==square[3])
        return 1;
    else if(square[4]==square[5] && square[5]==square[6])
        return 1;
    else if(square[7]==square[8] && square[8]==square[9])
        return 1;
    else if((square[1]==square[4] && square[4]==square[7]))
        return 1;
    else if((square[2]==square[5] && square[5]==square[8]))
        return 1;
    else if((square[3]==square[6] && square[6]==square[9]))
        return 1;
    else if((square[1]==square[5] && square[5]==square[9]))
        return 1;
    else if((square[3]==square[5] && square[5]==square[7]))
        return 1;
        else if(square[1]!='1' && square[2]!='2' && square[3]!='3' && square[4]!='4' && square[5]!='5' && square[6]!='6' && square[7]!='7' && square[8]!='8' && square[9]!='9')
            return 0;
        else
            return -1;

}
void drawBoard()0
{
    system("cls");
    printf("\n\n\t Tic Tac Toe \n\n");
    printf("Player1 (X) - Player2(O) \n\n\n");
    printf("    |    |    \n");
    printf(" %c  | %c  | %c \n ",square[1],square[2],square[3]);
    printf("---|----|---\n");
    printf("    |    |    \n");
    printf(" %c  | %c  | %c \n ",square[4],square[5],square[6]);
    printf("---|----|---\n");
    printf("    |    |    \n");
    printf(" %c  | %c  | %c \n ",square[7],square[8],square[9]);
    printf("---|----|---\n");
    printf("    |    |    \n");



}