C++二维数组名的再探索

#include <iostream>

int main()

{

    int d2a[][] = { , , , , , , , , , , ,  };

    //输出 0,1,2,3,4,5,6,7,8,9,10,11

    for (size_t i = ; i < ; i++)

    {

        for (size_t j = ; j < ; j++)

        {

            std::cout << d2a[i][j] << ",";

        }

    }

    //输出 0077FD04,0077FD04,0077FD14,0077FD24

    //可见二维数组名是数据首地址，d2a[0],d2a[1],d2a[2]分别是第一行，第二行，第三行的首地址

    std::cout << d2a << "," << d2a[] << "," << d2a[] << "," << d2a[] << std::endl;

    //最直观的顺序输出所有元素的方式

    //输出 0,1,2,3,4,5,6,7,8,9,10,11

    int* pa = (int*)d2a;

    for (size_t i = ; i < ; i++)

    {

        std::cout << *(pa + i) << ",";

    }

    //最难理解的二维数组名当指针的输出方式

    //输出 0,1,2,3,4,5,6,7,8,9,10,11

    for (size_t i = ; i < ; i++)

    {

        std::cout << *(*d2a + i) << ",";

        //错误方式，虽然二维数组指向数组首地址，但相当于行指针，d2a+0 = d2a[0], d2a+1 = d2a[1],d2a+2=d2a[2]

        //std::cout << *(d2a + i) << ",";

    }

    //理解了二维数组名的实质后，下面的就容易理解了

    char str[] = "ab";

    char(*px)[] = &str;

    (*px)[] = 'a';

    (*px)[] = 'b';

    (*px)[] = 'c';

}