TicTacToe.c

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


char square[10]={'0','1','2','3','4','5','6','7','8','9'};
int checkwin();
void drawboard();
int main()
{
system("color 74");
int player=1,i,choice;
char mark;
do
{
    drawboard();
    player=(player%2)?1:2;
    printf("Player %d Enter Your 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 Option...");
        player--;
        getch();
    }
    i=checkwin();
    printf(" before%d\n",player);
    player++;
    printf("after%d\n",player);
} while (i==-1);
drawboard();
if(i==1)
{
    printf("======>Player %d Won......",--player);
}
else
{
    printf("======>Game Graw");
}
getch();
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()
{
    int j;
    
    printf("\n\n\t\t\tTIC TAC TOE GAME...\n\n");
    printf("Player 1(X) - Player 2(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");
}