使用三重指针将内存分配给3D数组 [英] Assign Memory to 3D array using triple pointer

问题描述

我必须使用三重指针将内存分配给3D阵列.

I have to assign memory to a 3D array using a triple pointer.

#include <stdio.h>
int main()
{
    int m=10,n=20,p=30;
    char ***z;
    z = (char***) malloc(sizeof(char**)*m*n*p);
    return 0;
}

这样做是正确的方法吗?(我认为我做的不正确.)

Is this correct way of doing this?(I think what i am doing is incorrect.)

推荐答案

要完全分配3D动态数组，您需要执行以下操作:

To completely allocate a 3D dynamic array you need to do something like the following:

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int m=10,n=20,p=30;
    char ***z;

    z = malloc(m * sizeof(char **));
    assert(z != NULL);
    for (i = 0; i < m; ++i)
    {
        z[i] = malloc(n * sizeof(char *));
        assert(z[i] != NULL);
        for (j = 0; j < n; ++j)
        {
            z[i][j] = malloc(p);
            assert(z[i][j] != NULL);
        }
    }
    return 0;
}

释放数据留给读者练习.

Freeing the data is left as an exercise for the reader.

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