c++ - 语义问题 : No matching function for call to 'displayBoard'

Question

我只是调用一个以二维数组作为参数的函数。我不明白为什么它告诉我没有函数可以调用，我可以看到函数。这是我代码开头的原型(prototype): void displayBoard(int [][COLS], int);这是调用 displayBoard 的函数和 displayBoard 函数:

void playerTurn()
{
    char board[ROWS][COLS] = {{'*', '*', '*'}, {'*', '*', '*'}, {'*', '*', '*'}};
    char row, col;

    displayBoard(board, ROWS);
    cout << "Player X's Turn.\nEnter a row and a column to place an X.\nRow: ";
    cin >> row;
    cout << "\nColumn: ";
    cin >> col;
    //clear screen
    //edit contents of 2D array
    displayBoard(board, ROWS);
    cout << "Player O's Turn.\nEnter a row and a column to place an X.\nRow: ";
    cin >> row;
    cout << "\nColumn: ";
    cin >> col;
    //Validate each user's move (make sure there isn't an x or o already there
    //Ask for a re-input is validation fails
}

void displayBoard(const char board[][COLS], int ROWS)
{
    cout << setw(14) << "Columns" << endl;
    cout << setw(14) << "1 2 3 " <<  endl;
    cout << "Row 1:  " << board[0][0] << " " << board[0][1] << " " << board[0][2] << endl;
    cout << "Row 2:  " << board[1][0] << " " << board[1][1] << " " << board[1][2] << endl;
    cout << "Row 3:  " << board[2][0] << " " << board[2][1] << " " << board[2][2] << endl;
    cout << endl;
}

它在 playerTurn 函数的两次调用中都给出了错误。我不知道我做错了什么。

Answer 1

你在函数定义之前声明了

void displayBoard(int [][COLS], int);

然后在 playerTurn() 中调用

displayBoard(board, ROWS);

这里 board 是一个 char board[ROWS][COLS] 所以编译器会查看它是否已经看到一个声明或定义的名为 displayBoard< 的函数 接受这些参数。由于编译器没有看到它，它会发出错误。

要解决此问题，您需要将 decleration 更改为

void displayBoard(const char board[][COLS], int ROWS);

或者您可以只更改函数的顺序并在 displayBoard() 之前定义 playerTurn()