求助二维数组的赋值

void Place_mines(int board[ROW][COL], int row, int col)
{
    int x = 0;
    int y = 0;
    int num = 0;
    while (1)
    {
        x = rand() % 9;
        y = rand() % 9;
        if (board[x][y] == 1)
        {
            continue;
        }
        if (board[x][y] != 1)
        {
            board[x][y] = '1';
            num++;
        }
        if (num == 10)
        {
            break;
        }
    }
}


board[x][y] = '1';这里什么么要加‘’。我定义的是int啊？但如果不加，输出的1就会变成框框。