const int = int const？ [英] const int = int const?

问题描述

例如，是

int const x = 3;

有效的代码？

它的含义与

const int x = 3;

？

推荐答案

它们都是有效的代码，它们都是等效的。对于指针类型，虽然它们都是有效的代码，但不是等价的。

They are both valid code and they are both equivalent. For a pointer type though they are both valid code but not equivalent.

声明两个常量的int：

Declares 2 ints which are constant:

int const x1 = 3;
const int x2 = 3;

声明一个指针，其数据不能通过指针改变：

Declares a pointer whose data cannot be changed through the pointer:

const int *p = &someInt;

声明不能更改为指向其他对象的指针：

Declares a pointer who cannot be changed to point to something else:

int * const p = &someInt;

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