为什么X [Y] == Y [X]在C ++？ [英] Why does x[y] == y[x] in c++?

问题描述

可能重复：结果
  在C数组为什么这是真的吗？一个[5] == 5 [A]

有人告诉我这个...我不相信他们在第一，但它确实工作。如果x和y不整个code改变，为什么这项工作：

Someone told me this... I didn't believe them at first but it does work. If x and y do not change throughout the code, why does this work:

int x [5] = { 0,1,2,3,4};
int y = 3;

if(x[y] == y[x]){
    cout << "Why..." << endl;
}

如何点¯x数组的索引y值是= x索引的价值在列Y？但没有Ÿ阵列。

How does x array's value in index y is = the x index's value's in array y? But there was no y array.

推荐答案

这始终是真实的（正常的==操作符）

It is always true (for normal operator==)

a[i]  --> *(a+i) --> *(i+a) --> i[a]

因为int是内在的，有可交换的==操作符，这将永远是真实的。

since int is intrinsic and has commutative operator==, this will always be true

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