Tic Tac Toe: C++

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>


void red();
void green();
void position1(int,int);
void position2(int,int);
void check();
int turn=1,win=0,xc,yc;char game[3][3];

union REGS in,out;

void main()
{
int gd=DETECT,gm,errorcode;
initgraph(&gd,&gm,"D:\\tcc\\BGI");

in.x.ax=4;
in.x.cx=0;
in.x.dx=0;
int86(0X33,&in,&out);
in.x.ax=1;
int86(0X33,&in,&out);



outtextxy(100,20,"player 1");
rectangle(100,30,150,80);
outtextxy(180,20,"player 2");
rectangle(180,30,230,80);


 red();
 green();

line(100,100,100,200);//vertical 1
line(130,100,130,200);//vertical 2
line(160,100,160,200);//vertical 3
line(190,100,190,200);//vertical 4
line(100,130,190,130);//horizontal 1
line(100,160,190,160);//horizontal 2



while((turn<=9)&&(win==0))
 { int  click=0;
    while(click==0)
     {
       in.x.ax=3;
    int86(51,&in,&out);

    if(out.x.bx==1)
    {
     click=1;

    xc=out.x.cx;
    yc=out.x.dx;

       if(turn%2!=0)//player 1
      {
       setcolor(GREEN);
      circle(xc,yc,3);

     position1(xc,yc);

    }

    else if(turn%2==0)//player 2
    {
       setcolor(RED);
      circle(xc,yc,3);
      position2(xc,yc);

     }

      }
    }//end of inner while

  if(turn>=5)
  check();
  turn++;
  delay(1000);
 }//end of outer while

if(win==0)
outtext("draw");

 // delay(3000);
   getch();
  closegraph();

// printf("....GAME OVER....");
//getch();
}//end of main



    void red()
    {
     setcolor(RED);
     circle(205,55,15);
    }

    void green()
    {
     setcolor(GREEN);
     circle(125,55,15);
     setcolor(WHITE);
      }

    void position1(int xc,int yc)
       {
        if(((100<xc)&&(xc<130))&&((100<yc)&&(yc<130)))
        game[0][0]='g';
         else if(((130<xc)&&(xc<160))&&((100<yc)&&(yc<130)))
         game[0][1]='g';
         else if(((160<xc)&&(xc<190))&&((100<yc)&&(yc<130)))
         game[0][2]='g';
          else if(((100<xc)&&(xc<130))&&((130<yc)&&(yc<160)))
          game[1][0]='g';
        else if(((130<xc)&&(xc<160))&&((130<yc)&&(yc<160)))
       game[1][1]='g';
        else if(((160<xc)&&(xc<190))&&((130<yc)&&(yc<160)))
       game[1][2]='g';
        else if(((100<xc)&&(xc<130))&&((160<yc)&&(yc<190)))
       game[2][0]='g';
        else if(((130<xc)&&(xc<160))&&((160<yc)&&(yc<190)))
       game[2][1]='g';
        else if(((160<xc)&&(xc<190))&&((160<yc)&&(yc<190)))
       game[2][2]='g';

       }
      void position2(int xc,int yc)
    {
     if(((100<xc)&&(xc<130))&&((100<yc)&&(yc<130)))
      game[0][0]='r';
      else if(((130<xc)&&(xc<160))&&((100<yc)&&(yc<130)))
      game[0][1]='r';
     else if(((160<xc)&&(xc<190))&&((100<yc)&&(yc<130)))
         game[0][2]='r';
          else if(((100<xc)&&(xc<130))&&((130<yc)&&(yc<160)))
          game[1][0]='r';
        else if(((130<xc)&&(xc<160))&&((130<yc)&&(yc<160)))
       game[1][1]='r';
        else if(((160<xc)&&(xc<190))&&((130<yc)&&(yc<160)))
       game[1][2]='r';
        else if(((100<xc)&&(xc<130))&&((160<yc)&&(yc<190)))
       game[2][0]='r';
        else if(((130<xc)&&(xc<160))&&((160<yc)&&(yc<190)))
       game[2][1]='r';
        else if(((160<xc)&&(xc<190))&&((160<yc)&&(yc<190)))
       game[2][2]='r';

     }

     void check()

    {
      if(turn%2!=0)
        {
          if((game[0][0]==game[0][1])&&(game[0][0]==game[0][2]))//first row
          {
           if(game[0][0]=='g')
           {outtext("player 1 wins");
           win=1;}
          }
        else if((game[0][0]==game[1][1])&&(game[0][0]==game[2][2]))//leading diagonal
     {
      if(game[0][0]=='g')
     { outtext("player 1 wins");
      win=1;  }
      }
          else if((game[0][0]==game[1][0])&&(game[0][0]==game[2][0]))//first column
     {
      if(game[0][0]=='g')
     { outtext("player 1 wins");
      win=1;}
      }
          else    if((game[1][0]==game[1][1])&&(game[1][0]==game[1][2]))//2nd row
     {
      if(game[1][0]=='g')
     { outtext("player 1 wins");
      win=1;}
      }
        else if((game[2][0]==game[2][1])&&(game[2][0]==game[2][2])) //3rd row
     {
      if(game[2][0]=='g')
     { outtext("player 1 wins");
      win=1; }
      }
        else if((game[0][2]==game[1][1])&&(game[0][2]==game[2][0])) //other diagonal
     {
      if(game[0][2]=='g')
     { outtext("player 1 wins");
      win=1;}
      }

        else if((game[0][1]==game[1][1])&&(game[0][1]==game[2][1])) //2nd column
     {
      if(game[0][1]=='g')
     { outtext("player 1 wins");
      win=1; }
      }
        else if((game[0][2]==game[1][2])&&(game[0][2]==game[2][2])) //3rd column
     {
      if(game[0][2]=='g')
     { outtext("player 1 wins");
      win=1;}
      }
     }

     else if(turn%2==0)
    {
          if((game[0][0]==game[0][1])&&(game[0][0]==game[0][2]))//1st row
          {
           if(game[0][0]=='r')
         {  outtext("red wins");
           win=1;}
          }
        else if((game[0][0]==game[1][1])&&(game[0][0]==game[2][2]))//leading diagonal
     {
      if(game[0][0]=='r')
    {  outtext("player 2 wins");
      win=1;}
      }
          else  if((game[0][0]==game[1][0])&&(game[0][0]==game[2][0])) //1st column
     {
      if(game[0][0]=='r')
      {outtext("player 2 wins");
      win=1;}
      }
         else   if((game[1][0]==game[1][1])&&(game[1][0]==game[1][2])) //2nd row
     {
      if(game[1][0]=='r')
     { outtext("player 2 wins");
      win=1; }
      }
           else if((game[2][0]==game[2][1])&&(game[2][0]==game[2][2]))//3rd row
     {
      if(game[2][0]=='r')
      {outtext("player 2 wins");
      win=1;}
      }
    else if((game[0][2]==game[1][1])&&(game[0][2]==game[2][0])) //other diagonal
     {
      if(game[0][2]=='r')
     { outtext("player 2 wins");
      win=1;}
      }

        else if((game[0][1]==game[1][1])&&(game[0][1]==game[2][1])) //2nd column
     {
      if(game[0][1]=='r')
     { outtext("player 2 wins");
      win=1;}
      }
        else if((game[0][2]==game[1][2])&&(game[0][2]==game[2][2])) //3rd column
     {
      if(game[0][2]=='r')
     { outtext("player 2 wins");
      win=1;}
      }
    }
    }