Question

我试图返回一个指向2d char数组的指针（主要是为了练习使用指针，因为我还不太了解它们）。

当我编译它时，我收到消息：

Maze Game.cpp(32): error C2440: 'initializing' : cannot convert from 'char (*)[8]' to 'char **'

第32行是：

char** acBoard = new char[8][8];

以下是源代码：

#include "stdafx.h"
#include <iostream>

char** createGrid();

int main()
{
    using namespace std;

    char** pBoard = createGrid();
    char gameBoard[8][8];

    for(int row = 0; row < 8; row++) {
        int count = 0;
        for(int col = 0; col < 8; col++) {
            char temp = **pBoard + count;
            gameBoard[row][col] = temp;
            cout << gameBoard[row][col];
        }
        cout << endl;
    }
    delete pBoard;
    pBoard = 0;

    return 0;
}





char** createGrid()
{
    char** acBoard = new char[8][8];
        //Set wall positions
    acBoard[1][6] = 'X';            
    acBoard[1][7] = 'X';
    acBoard[3][4] = 'X';
    acBoard[3][6] = 'X';
    acBoard[3][8] = 'X';
    acBoard[4][1] = 'X';
    acBoard[4][3] = 'X';
    acBoard[4][4] = 'X';
    acBoard[4][5] = 'X';
    acBoard[4][6] = 'X';
    acBoard[4][7] = 'X';
    acBoard[5][1] = 'X';
    acBoard[5][3] = 'X';
    acBoard[5][4] = 'X';
    acBoard[5][8] = 'X';
    acBoard[6][1] = 'X';
    acBoard[6][2] = 'X';
    acBoard[6][3] = 'X';
    acBoard[6][6] = 'X';
    acBoard[6][8] = 'X';
    acBoard[7][1] = 'X';
    acBoard[7][5] = 'X';
    acBoard[7][6] = 'X';
    acBoard[7][8] = 'X';
    acBoard[8][3] = 'X';
    acBoard[8][5] = 'X';
    acBoard[8][6] = 'X';
    acBoard[8][7] = 'X';
    acBoard[8][8] = 'X';

    acBoard[1][8] = 'N';
    acBoard[7][7] = 'T';
    acBoard[5][2] = 'W';
    acBoard[2][2] = '$';

    return acBoard;

}

任何人都可以向我解释为什么会这样吗？

Answer 1

它确切地告诉你问题是什么 - char **和你的2D数组是不兼容的类型。你需要：

char (*acBoard)[8] = new char[8][8];

其他地方相应的变化。或者，您可以更改分配以创建指向其他数组的指针数组。

除此之外：C ++使用0索引数组。

Answer 2

请参阅link关于使用new分配2D数组的信息。

如果你这样做，理解起来要简单得多：

struct Board
{
    char cells[8][8] ;
};

Board* create()
{
    Board* board = new Board;
    return board;
}

当然，只要我们做到这一点，我们就会意识到这是C ++，将struct更改为class并使其成为正确的对象。

试图将点返回到2d char数组

2 个答案: