指向二维数组的指针 [英] A pointer to 2d array

问题描述

我有一个关于指向二维数组的指针的问题.如果数组类似于

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的指针吗?

then, is this a pointer to array a?

int (*p)[3] = a;

如果这是正确的，我想知道 [3] 从 int(*p)[3] 是什么意思?

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

推荐答案

与其将 int[2][3] 称为二维数组"，您应该将其视为一个数组数组'.它是一个包含两个项目的数组，其中每个项目本身就是一个包含 3 个整数的数组.

Rather than referring to int[2][3] as a '2d array', you should consider it 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 来指向a 中的两个项目中的任何一个.p 指向一个三整数数组——即第一个这样的项目.p+1 将指向第二个三整数数组.要初始化 p 以指向第二个元素，请使用:

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

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

以下是指向两项中第一项的等效方法.

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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