访问数组内容：x [n] vs n [x] [英] Accessing array contents: x[n] vs n[x]

问题描述

可能重复：

通过C和C ++中的索引[array]访问数组

我最近发现了一些我从来没有见过的在C（和C + +）中访问数组的内容，你可以使用 x [n] 或 n [x]

与 3 [x]

相同所以我的第一个问题是这个工作，有什么使用第二个语法是有用的（除了让我困惑）。

解决方案

x [n] 为 *（x + n）

p>

n [x] 是 *（n + x）

，所以表达式是等效的。使用第二个没有什么好处。

Possible Duplicate:
Accessing arrays by index[array] in C and C++

I have recently found out something that I had never seen before in C (and C++) in that for accessing the contents of an array you can use x[n] or n[x]

So for example x[3] is the same as 3[x]

So my first question is how does this work and is there anything using the 2nd syntax that is useful (apart from confusing me)?

解决方案

x[n] is *(x + n)

and

n[x] is *(n + x)

so the expressions are equivalent. There is nothing beneficial in using the second.

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