修改数组的值

我是c++的新手，因为我的第一个任务是制作一个逆转游戏，但我在playGame函数中输入玩家时遇到了问题。因此，当我输入x和y时，它会将棋盘数组[x][y]的值从空或"改为'B'"。我也不知道如何将数组引用到函数。如果这些问题对某些人来说很愚蠢，我很抱歉，但请原谅我，我是自学的。由于

#include <iostream>
#include <string>
using namespace std;
void displayTop();
void displayAlpha();
void displayNum();
int displayMenu();
void displayBoard();
char displayHelp();
void playGame();
int num = 8;
char board [8][8] = {
' ',' ',' ',' ',' ',' ',' ',' ',
' ',' ',' ',' ',' ',' ',' ',' ',
' ',' ',' ',' ',' ',' ',' ',' ',
' ',' ',' ','W','B',' ',' ',' ',
' ',' ',' ','B','W',' ',' ',' ',
' ',' ',' ',' ',' ',' ',' ',' ',
' ',' ',' ',' ',' ',' ',' ',' ',
' ',' ',' ',' ',' ',' ',' ',' ',
};
int main() {
    int choice = displayMenu();
    switch (choice) {
        case 1:
            displayBoard();
            break;
        case 2:
            displayHelp();
            break;
        default:
            cout << "Please enter a valid choice." << endl;
            break;
    }
    playGame();
}
void displayBoard(){

    displayTop();
    for (int row = 0; row < 8; row++){
        displayNum();
        cout << "   |";
        for (int column = 0; column < 8; column++){
            cout << board[row][column] << "   |";
        }
        cout << endl;
        displayTop();
    }
    displayAlpha();
}
void displayTop(){
    cout << "    ";
    for (int i = 0; i < 8; i++){
        cout << "+----";
    }
    cout << endl;
}
void displayAlpha(){
    cout << "   ";
    for( char i = 'a'; i <= 'h'; i++ ) {
    cout << "    " << i ;
    }
}
void displayNum(){
    if (num > 0) {
        cout << num;
        num = num - 1;
    }
}
int displayMenu(){
    int answer = 0;
    cout << "Othellonn"
    << "1.New Gamen2.Helpn3.QuitnYour Choice: ";
    cin >> answer;
    system("clear");
    return answer;
}
char displayHelp(){
    char answer = ' ';
    cout << "How to play OthellonnThe object of the game is to have     the majority of your colour discs on the board at the end of the     game.nnInput the cell where you want to place your disc in the form of     (a-z 1-8) without the bracket and includng the space.nnThe one with the     most discs wins!!!!nnSo, are you ready to play? (y or n)nnYour Choice:    ";
    cin >> answer;
    if (answer == 'y')
        displayBoard();
    return answer;
}
void playGame(){
    int plW = 2;
    int plB = 2;
    int x = 0;
    int y = 0;
    char player = 'B';
    for(;;){
        cout << "nnScore: W = " << plW << " B = " << plB;
        cout << "nPlayer: " << player;
        cout << "nPlease make your move : ";
        cin >> x >> y;
        cout << endl;
        if (x < 9 && y < 9) {
            board[x-1][y-1] = player;
            displayBoard();
        } else {
            cout << "Invalid Input";
        }
        if (player == 'B') {
            plB++;
            player = 'W';
        } else {
            plW++;
            player = 'B';
        }
    }
}