TIC TAC TOE using c++

Hello guys today i am gonna give you the source code to build a TIC TAC TOE in C++.....
for any query you can place a comment..
note this program is build in code blocks compiler
you can also download the source code @ TIC TAC TOE

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#include<iostream>

#include<stdlib.h>

#include<conio.h>

#include<windows.h>

using namespace std;

COORD coord={0,0};

 void gotoxy(int x,int y)

 {

 coord.X=x;

 coord.Y=y;

 SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),coord);

 }//for gotoxy

void setup();

void input();

void output();

int check();

bool game,p1;

int ip,pos[9]={98,99,979,79,998,66,77,88,12},counter,

history[9]={98,99,979,79,998,66,77,88,12};

int main()

{

    int result;

    setup();

    while(game==true)

    {

        input();

        output();

        result=check();

    }

    gotoxy(10,21);

    if(result==1)

    {

        switch(p1)

        {

        case true:

            cout<<"\aplayer 1 wins.......\n DEVELOPED BY - MAYANK AGRAWAL\a";

            getch();

            break;

        case false:

            cout<<"\aplayer 2 wins ........\n DEVELOPED BY - MAYANK AGRAWAL\a";

            break;

        }

    }

    else

        cout<<"\a\amatch draw !!! \n DEVELOPED BY - MAYANK AGRAWAL\a";

}

void setup()

{

    counter=0;

    game=true;p1=true;

    gotoxy(20,0);

    cout<<"TIC TAC TOE";

    for(int j=1;j<3;j++)

    {

    for(int i=4;i<=16;i++)

    {

        gotoxy(10*j,i);

        cout<<"|";

    }}

    for(int i=8;i<=12;i+=4)

    {

        for(int j=3;j<=26;j++)

        {

            gotoxy(j,i);

            cout<<"-";

        }

    }

    int x[3]={5,14,24};

    int y[3]={6,10,14};

    for(int i=0,a=1;i<3;i++)

    {

        for(int j=0;j<3;j++)

        {

            gotoxy(x[j],y[i]);

            cout<<a;

            a++;

        }

    }

    gotoxy(3,2);

    cout<<"PLAYER 1 (X) .....PLAYER 2(O)";

    gotoxy(5,20);

    cout<<"player   ,enter place : ";

}

void input()

{

     gotoxy(12,20);

     if(p1==true)

        cout<<"\a1";

     else

        cout<<"\a2";

     gotoxy(29,20);

     cout<<" ";

     do

     {

     cin.ignore();    //buffer problem

     gotoxy(30,20);

     cout<<" ";

     gotoxy(29,20);

     cin>>ip;

     }while(ip<0||ip>10||ip==history[0]||ip==history[1]||ip==history[2]||

ip==history[3]||ip==history[4]||ip==history[5]||ip==history[6]

||ip==history[7]||ip==history[8]);

     if(p1==true)

     pos[ip-1]=0;

     else

        pos[ip-1]=1;

    history[counter]=ip;

}

void output()

{

    switch(ip)

    {

        case 1: gotoxy(5,6);

        break;

        case 2: gotoxy(14,6);

        break;

        case 3: gotoxy(24,6);

        break;

        case 4: gotoxy(5,10);

        break;

        case 5: gotoxy(14,10);

        break;

        case 6: gotoxy(24,10);

        break;

        case 7: gotoxy(5,14);

        break;

        case 8: gotoxy(14,14);

        break;

        case 9: gotoxy(24,14);

        break;

    }

    switch(p1)

    {

        case true: cout<<"X";

        break;

        case false: cout<<"O";

        break;

    }

}

int check()

{

    counter++;

    for(int i=0;i<=6;i+=3)

    {

   if(pos[0+i]==pos[1+i]&&pos[1+i]==pos[2+i])

      {

          game=false;

          return 1;

      }

    }

     for(int i=0;i<=3;i++)

    {

   if(pos[0+i]==pos[3+i]&&pos[3+i]==pos[6+i])

      {

          game=false;

          return 1;

      }

    }

    if(pos[0]==pos[4]&&pos[4]==pos[8])

    {

        game=false;

        return 1;

    }

    if(pos[2]==pos[4]&&pos[4]==pos[6])

    {

        game=false;

        return 1;

    }

    if(counter==9)

    {

        game=false;

        return 0;

    }

    if(p1==true)

        p1=false;

    else

        p1=true;

    return 0;

}

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OUTPUT :-

                                 THANK YOU!!!!