一个指向二维数组 [英] A pointer to 2d array

问题描述

我有一个关于一个指针二维数组的问题。如果数组是一样的东西。

I have a question about a pointer to 2d array. If an array is something like

int a[2][3];

那么，这是一个指向数组 A ？

int (*p)[3] = a;

如果这是正确的，我想知道什么呢 [3] 从 INT（* P）指[3] ？

If this is correct, I am wondering what does [3] mean from int(*p)[3]?

推荐答案

而不是指 INT [2] [3] 为二维数组，你应该考虑到是一个数组的数组。它带有两个项目，每个项目本身就是其与3整型数组的数组。

Rather than referring to int[2][3] as a '2d array', you should consider in to be an 'array of arrays'. It is an array with two items in it, where each item is itself an array with 3 ints in it.

int (*p)[3] = a;

您可以使用 P 以指向这两个项目的 A 。 P 指向三个int数组，第一个这样的项目。 P + 1 将指向第二个三int数组。要初始化 P 来指向第二个元素

You can use p to point to either of the two items in a. p points to a three-int array, the first such item. p+1 would point to the second three-int array. To initialize p to point to the second element

int (*p)[3] = &(a[1]);

以下是等效的方式指向所述第一两个项目的

The following are equivalent ways to point to the first of the two items.

int (*p)[3] = a; // as before
int (*p)[3] = &(a[0]);

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