Tic-Tac-Toe Game using C program

#include<stdio.h>
#include<conio.h>
void main()
{
int i = 0;                                   /* Loop counter                         */
int player = 0;                              /* Player number - 1 or 2               */
int go = 0;                                  /* Square selection number for turn     */
int row = 0;                                 /* Row index for a square               */
int column = 0;                              /* Column index for a square            */
int line = 0;                                /* Row or column index in checking loop */
int winner = 0;                              /* The winning player                   */
char board[3][3] = {                         /* The board                            */
{'1','2','3'},          /* Initial values are reference numbers */
{'4','5','6'},          /* used to select a vacant square for   */
{'7','8','9'}           /* a turn.                              */
};

clrscr();
/* The main game loop. The game continues for up to 9 turns */
/* As long as there is no winner                            */
for( i = 0; i<9 && winner==0; i++)
{
/* Display the board */
printf("\n\n");
printf(" %c | %c | %c\n", board[0][0], board[0][1], board[0][2]);
printf("---+---+---\n");
printf(" %c | %c | %c\n", board[1][0], board[1][1], board[1][2]);
printf("---+---+---\n");
printf(" %c | %c | %c\n", board[2][0], board[2][1], board[2][2]);

player = i%2 + 1;                           /* Select player */

/* Get valid player square selection */
do
{
printf("\nPlayer %d, please enter the number of the square "
"where you want to place your %c: ", player,(player==1)?'X':'O');
scanf("%d", &go);

row = --go/3;                                 /* Get row index of square      */
column = go%3;                                /* Get column index of square   */
}while(go<0 || go>9 || board[row][column]>'9');

board[row][column] = (player == 1) ? 'X' : 'O';        /* Insert player symbol   */

/* Check for a winning line - diagonals first */
if((board[0][0] == board[1][1] && board[0][0] == board[2][2]) ||
(board[0][2] == board[1][1] && board[0][2] == board[2][0]))
winner = player;
else
/* Check rows and columns for a winning line */
for(line = 0; line <= 2; line ++)
if((board[line][0] == board[line][1] && board[line][0] == board[line][2])||
(board[0][line] == board[1][line] && board[0][line] == board[2][line]))
winner = player;

}
/* Game is over so display the final board */
printf("\n\n");
printf(" %c | %c | %c\n", board[0][0], board[0][1], board[0][2]);
printf("---+---+---\n");
printf(" %c | %c | %c\n", board[1][0], board[1][1], board[1][2]);
printf("---+---+---\n");
printf(" %c | %c | %c\n", board[2][0], board[2][1], board[2][2]);

/* Display result message */
if(winner == 0)
printf("\nHow boring, it is a draw\n");
else
printf("\nCongratulations, player %d, YOU ARE THE WINNER!\n",

winner);
getch():
}