I have written a progam that allows two people to play tictactoe, how can I modify it so that the second player becomes the computer?

************source code***********8

#include <stdio.h>

#define SIZE 3

void display( int[][] );

int winner( int[][] );

int main()

{

int win = -1, i, j, col, row, player = 0;

int array[SIZE][SIZE];

printf( "TIC TAC TOE\n\n" );

// initalize the array

for ( i = 0; i < SIZE; i++ )

for( j = 0; j < SIZE; j++ )

array[i][j] = -3;

while (win == -1) {

display( array );

printf( "Enter row(0 to quit): " );

scanf( "%d", &row ); // read in row

if (row == 0 )

break;

printf( "Enter column: ");

scanf( "%d", &col ); // read in col

if ( array[row-1][col-1] == -3 ) { // check if square is empty

array[row-1][col-1] = (player); // assign player# to square

player = (player+1)%2;

}

else

printf( "Invalid entry\n" );

win = winner( array );

if ( win == 0 ) {

display( array );

printf( "X is the winner\n" );

}

if ( win == 1 ) {

display( array );

printf( "O is the winner\n" );

}

}

return 0;

}

void display( int board[SIZE][SIZE] )

{

int i, j;

printf("1 2 3\n\n" ); // print first line

for( i = 0; i < SIZE; i++ ) {

for( j = 0; j < SIZE; j++ ) {

if ( board [i][j] == 0 ) // print X

printf( "X " );

if ( board [i][j] == 1 ) // print O

printf( "O " );

if ( board [i][j] == -3 ) // print blank

printf( " " );

}

printf( "%d\n\n", i+1); // print row number

}

}

int winner( int board[SIZE][SIZE] )

{

int i, j, total = 0, win = -1;

// check horizontal

for( i = 0; i < SIZE; i++ ) {

for( j = 0; j < SIZE; j++ )

total += board[i][j];

if ( total == 0 )

win = 0;

if ( total == 3 )

win = 1;

total = 0;

}

// check vertical

for( j = 0; j < SIZE; j++ ) {

for( i = 0; i < SIZE; i++ )

total += board[i][j];

if ( total == 0 )

win = 0;

if ( total == 3 )

win = 1;

total = 0;

}

// check diagonals

for( j = 0; j < SIZE; j++ )

total += board[j][j];

if ( total == 0 )

win = 0;

if ( total == 3 )

win = 1;

total = board[0][2] + board[1][1] + board[2][0];

if ( total == 0 )

win = 0;

if ( total == 3 )

win = 1;

return win;

}

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