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