C指针，指向：* PTR VS＆放大器; PTR VS PTR [英] C Pointers: *ptr vs &ptr vs ptr

问题描述

假设 * PTR 指向一个变量。这是什么 * PTR ，＆放大器; PTR 和 PTR 各是什么意思？

Suppose *ptr points to a variable. What does *ptr, &ptr, and ptr each mean?

很多时候，我让他们之间的混淆。不要介意任何人的语句之间明确并给出一些具体的例子？

Many times, I get confused between them. Do anyone mind clarifying between those statements and give some concrete examples?

推荐答案

参加一个函数下列变量。

Take the following variables in a function.

int i = 0;
int* ptr = &i;

在功能，内存布局可能看起来是这样的：

In the function, the memory layout could look something like:

对应内存 I ：

+---+---+---+---+
|       0       |
+---+---+---+---+
^
|
Address of i

对应内存 PTR ：

+---+---+---+---+
| address of i  |
+---+---+---+---+
^
|
Address of ptr

在上面的场景中，

*ptr == i == 0
ptr == address of i == address of memory location where the vale of i is stored
&ptr == address of ptr == address of memory location where the value of ptr is stored.

希望是有道理的。

Hope that makes sense.

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