指向数组 C++ 的指针 [英] pointer to array c++

问题描述

下面的代码在做什么?

int g[] = {9,8};
int (*j) = g;

根据我的理解，它创建了一个指向 2 个整数数组的指针.但是为什么这样做会起作用:

From my understanding its creating a pointer to an array of 2 ints. But then why does this work:

int x = j[0];

这不起作用:

int x = (*j)[0];

推荐答案

括号在您的示例中是多余的.指针不关心是否涉及数组 - 它只知道它指向一个 int

The parenthesis are superfluous in your example. The pointer doesn't care whether there's an array involved - it only knows that its pointing to an int

  int g[] = {9,8};
  int (*j) = g;

也可以改写为

  int g[] = {9,8};
  int *j = g;

也可以改写为

  int g[] = {9,8};
  int *j = &g[0];

指向数组的指针看起来像

a pointer-to-an-array would look like

  int g[] = {9,8};
  int (*j)[2] = &g;

  //Dereference 'j' and access array element zero
  int n = (*j)[0];

在此链接中对指针声明(以及如何理解它们)有很好的阅读:http://www.codeproject.com/Articles/7042/How-to-interpret-complex-CC-declarations

There's a good read on pointer declarations (and how to grok them) at this link here: http://www.codeproject.com/Articles/7042/How-to-interpret-complex-C-C-declarations

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