我的2D阵列已关闭，需要左​​下角为（0,0）

Question

我的代码显示了一个数据网格

grid [1] [1] = 3;

grid [2] [1] = 3;

grid [4] [5] = 3;

grid [5] [6] = 3;

但我的显示变为

  # # # # # # # # # # #
8 #                   #
7 #                   #
6 #                   #
5 #             3     #
4 #           3       #
3 #                   #
2 #   3               #
1 #   3               #
0 #                   #  
  # # # # # # # # # # #
    0 1 2 3 4 5 6 7 8

这是错误的

有点不对劲，我无法使2D阵列正确对齐。 声明2D数组时，我需要左下角为（x，y）==（0,0）

我想要的是

  # # # # # # # # # # #
8 #                   #
7 #                   #
6 #           3       #
5 #         3         #
4 #                   #
3 #                   #
2 #                   #
1 #   3 3             #
0 #                   #  
  # # # # # # # # # # #
    0 1 2 3 4 5 6 7 8


#include <iostream>

#include <string>

using namespace std;

int ** grid = nullptr;

void initGrid(int col, int row);
void populateGrid(int col, int row);
void safelyDeallocateMemory (int col, int row);

int main() {

    int row = 8
    int col = 8

    initGrid (col, row);
    populateGrid(col, row);
    safelyDeallocateMemory(col, row);
}

void initGrid (int col, int row) {
        grid = new int * [col];

        for (int i = 0; i < col; i++){
            grid [i] = new int [row];
        }

        //Information should stream from text file
        //test

        grid[1][1] = 3;
        grid[4][5] = 3;
        grid[2][1] = 3;
        grid[5][6] = 3;

    }


void populateGrid(int col, int row) {
        cout << "   ";
        //Top outer Grid
        for (int i = 0; i < col + 2; i++) {
            cout << " # ";
        }
        cout << " # ";
        cout << endl;
        //end

        //y-axis
    for (int i = row; i >= 0; i--) {
        cout << " " << i << "  #  ";

        //Number of Columns
    for (int j = 0; j <= col; ++j) {
       if (grid[i] == 0 || grid[j] == 0 ||grid[i][j] == 0) {
                cout << "   ";
       }    
       else  {
        cout << grid[i][j] << "  ";
       }    

    }   


    //Right outer Grid
        cout << "   #";
        cout << endl;
    }


    //Last row of #
        cout << "   ";
        for (int i = 0; i < col + 2; i++) {
            cout << " # ";
        }

        cout << " # ";
        cout << endl;
        cout << "       ";

        //x-Axis
        for (int i = 0; i <= col; i++) {
            cout << i << "  ";
        }

        cout << endl;

    }

我在声明数组时尝试了多种变体，但它无法按我的预期工作！

Answer 1

您只是错误地对待索引。

grid[2][1] = 3;与您的情况不同，grid[x][y] = 3;与grid[y][x] = 3;不同。

把它想象成一个数组数组。第一个索引描述数组在“数组数组”中的位置，第二个索引描述在该数组中的位置。

[0] -> [0] [1] [2] [3] [4] [5] <- row 0
[1] -> [0] [1] [2] [3] [4] [5] <- row 1
[2] -> [0] [1] [2] [3] [4] [5] <- row 2
[3] -> [0] [1] [2] [3] [4] [5] <- row 3
[4] -> [0] [1] [2] [3] [4] [5] <- row 4
[5] -> [0] [1] [2] [3] [4] [5] <- row 5

这取决于您如何处理这些索引。

获得所需结果的简单解决方案是通过以下方式更改void initGrid (int col, int row)：

void initGrid (int col, int row) {
    grid = new int * [row];

    for (int i = 0; i < row; i++){
        grid [i] = new int [col];
        for(int j = 0; j < col; j++) {
            grid[i][j] = 0;
        }
    }

    //Information should stream from text file
    //test

    grid[1][1] = 3;
    grid[5][4] = 3;
    grid[1][2] = 3;
    grid[6][5] = 3;

}

另外，您在使用void populateGrid(int col, int row)时遇到了一些麻烦，您正试图访问for (int j = 0; j <= col; ++j)中的超出范围的元素，因此您的代码应更像这样：

void populateGrid(int col, int row) {
    cout << "   ";
    //Top outer Grid
    for (int i = 0; i < col + 2; i++) {
        cout << " # ";
    }
    //cout << " # ";
    cout << endl;
    //end

    //y-axis
    for (int i = row - 1; i >= 0; i--) {
        cout << " " << i << "  #  ";

        //Number of Columns
        for (int j = 0; j < col; ++j) {
            if (grid[i][j] == 0) {
                cout << "   ";
            }    
            else  {
                cout << grid[i][j] << "  ";
            }    

        }   


        //Right outer Grid
        cout << "#";
        cout << endl;
    }


    //Last row of #
    cout << "   ";
    for (int i = 0; i < col + 2; i++) {
        cout << " # ";
    }

    cout << endl;
    cout << "       ";

    //x-Axis
    for (int i = 0; i < col; i++) {
        cout << i << "  ";
    }

    cout << endl;

}