This program is used to play tic tac toe game (C++)

This program is used to play tic tac toe game (C++)

#include< stdio.h>

#include< conio.h>

#include< stdlib.h>

int board[10] = {2,2,2,2,2,2,2,2,2,2};

int turn = 1,flag = 0;

int player,comp;

void menu();

void go(int n);

void start_game();

void check_draw();

void draw_board();

void player_first();

void put_X_O(char ch,int pos);

main()

{

        clrscr();

        _setcursortype(_NOCURSOR);

        menu();

        getch();

        return(0);

}

void menu()

{

        int choice;

        printf("\n--------MENU--------");

        printf("\n1 : Play with X");

        printf("\n2 : Play with O");

        printf("\n3 : Exit");

        printf("\nEnter your choice:>");

        scanf("%d",&choice);

        turn = 1;

        switch (choice)

        {

               case 1:

                       player = 1;

                       comp = 0;

                       player_first();

                       break;

               case 2:

                       player = 0;

                       comp = 1;

                       start_game();

                       break;

               case 3:

                       exit(0);

               default:

                       menu();

        }

}

int make2()

{

        if(board[5] == 2)

               return 5;

        if(board[2] == 2)

               return 2;

        if(board[4] == 2)

               return 4;

        if(board[6] == 2)

               return 6;

        if(board[8] == 2)

               return 8;

        return 0;

}

int make4()

{

        if(board[1] == 2)

               return 1;

        if(board[3] == 2)

               return 3;

        if(board[7] == 2)

               return 7;

        if(board[9] == 2)

               return 9;

        return 0;

}

int posswin(int p)

{

// p==1 then X   p==0  then  O

        int i;

        int check_val,pos;

        if(p == 1)

               check_val = 18;

        else

               check_val = 50;

        i = 1;

        while(i< =9)//row check

        {

               if(board[i] * board[i+1] * board[i+2] == check_val)

               {

                       if(board[i] == 2)

                               return i;

                       if(board[i+1] == 2)

                               return i+1;

                       if(board[i+2] == 2)

                               return i+2;

               }

               i+=3;

        }

        i = 1;

        while(i< =3)//column check

        {

               if(board[i] * board[i+3] * board[i+6] == check_val)

               {

                       if(board[i] == 2)

                               return i;

                       if(board[i+3] == 2)

                               return i+3;

                       if(board[i+6] == 2)

                               return i+6;

               }

               i++;

        }

        if(board[1] * board[5] * board[9] == check_val)

        {

               if(board[1] == 2)

                       return 1;

               if(board[5] == 2)

                       return 5;

               if(board[9] == 2)

                       return 9;

        }

        if(board[3] * board[5] * board[7] == check_val)

        {

               if(board[3] == 2)

                       return 3;

               if(board[5] == 2)

                       return 5;

               if(board[7] == 2)

                       return 7;

        }

        return 0;

}

void go(int n)

{

        if(turn % 2)

               board[n] = 3;

        else

               board[n] = 5;

        turn++;

}

void player_first()

{

        int pos;

        check_draw();

        draw_board();

        gotoxy(30,18);

        printf("Your Turn :> ");

        scanf("%d",&pos);

        if(board[pos] != 2)

               player_first();

        if(pos == posswin(player))

        {

               go(pos);

               draw_board();

               gotoxy(30,20);

               textcolor(128+RED);

               cprintf("Player Wins");

               getch();

               exit(0);

        }

        go(pos);

        draw_board();

        start_game();

}

void start_game()

{

        // p==1 then X   p==0  then  O

        if(posswin(comp))

        {

               go(posswin(comp));

               flag = 1;

        }

        else

        if(posswin(player))

               go(posswin(player));

        else

        if(make2())

               go(make2());

        else

               go(make4());

        draw_board();

        if(flag)

        {

               gotoxy(30,20);

               textcolor(128+RED);

               cprintf("Computer wins");

               getch();

        }

        else

               player_first();

}

void check_draw()

{

        if(turn > 9)

        {

               gotoxy(30,20);

               textcolor(128+RED);

               cprintf("Game Draw");

               getch();

               exit(0);

        }

}

void draw_board()

{

        int j;

        for(j=9;j< 17;j++)

        {

               gotoxy(35,j);

               printf("|       |");

        }

        gotoxy(28,11);

        printf("-----------------------");

        gotoxy(28,14);

        printf("-----------------------");

        for(j=1;j< 10;j++)

        {

               if(board[j] == 3)

                       put_X_O('X',j);

               else

               if(board[j] == 5)

                       put_X_O('O',j);

        }

}

void put_X_O(char ch,int pos)

{

        int m;

        int x = 31, y = 10;

        m = pos;

        if(m > 3)

        {

               while(m > 3)

               {

                       y += 3;

                       m -= 3;

               }

        }

        if(pos % 3 == 0)

               x += 16;

        else

        {

               pos %= 3;

               pos--;

               while(pos)

               {

                       x+=8;

                       pos--;

               }

        }

        gotoxy(x,y);

        printf("%c",ch);

}

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