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今天小编为大家带来的是

C语言（十）：指向指针的指针。

Share interests, spread happiness,

increase knowledge, and leave behind beauty!

Dear you, this is the Learning Yard New School.

Today's editor brings you

C language (10): Pointer to pointer.

一、思维导图

此推文关于指向指针的指针的内容主要如下：

The main content of this tweet about pointers to pointers is as follows:

二、关于解引用

请看下面一段代码：

Take a look at the following code：

在这里层层解引用最终都可以求得520.

Here, we can solve the problem of 520

num

520

p

&num

*p

num

520

pp

&p

*pp

p

&num

**pp

*p

num

520

第一行表示num中存放的值是520；

第二行表示p中存放的是num的地址；

第三行表示解引用p得到num，最终得到值520；

第四行表示pp中存放p的地址；

第五行表示奖pp解引用一次得到p,p中存放num的地址；

第六行表示将pp解引用两次得到num，进而得到值520；

The first line indicates that the value stored in num is 520;

The second line indicates that the address stored in p is num;

The third line indicates that the reference p is dereferenced to obtain num, and the final value 520 is obtained;

The fourth line indicates the address where p is stored in the pp;

The fifth line represents the address where the num is stored in p, which is obtained by dereference of the award pp once;

The sixth line indicates that the value 520 is obtained by dereferencing pp twice to obtain num;

三、指针数组和指向指针的指针

指针数组：一个数组的元素值为指针则是指针数组。指针数组是一组有序的指针的集合。

指向指针的指针运用的好处：避免重复分配内存；只需要进行一处修改；代码的灵活性和安全性都显著提高

Pointer array: An array whose element value is a pointer is a pointer array. A pointer array is an ordered collection of pointers.

Advantages of using pointers to pointers: avoiding repeated memory allocation; Only one modification is required; Significant improvements in code flexibility and security

四、数组指针和二维数组

如图所示，用指针间接访问一维数组：

As shown in the figure, use a pointer to indirectly access a one-dimensional array:

但是指针不能间接访问二维数组，如图示：

However, pointers cannot indirectly access two-dimensional arrays, as shown in the figure:

主要是因为二维数组是连续存放的，主要解释如图所示：

The main reason is that two-dimensional arrays are stored continuously. The main explanation is shown in the figure:

改进后用指针表示二维数组，如图示：

After improvement, a pointer is used to represent a two-dimensional array, as shown in the figure:

详细解释链接：

Detailed explanation link:

结语：编者认为指针部分比较难懂，所以文章有什么问题还请大家提出来。

Conclusion: The editor thinks that the pointer part is difficult to understand, so if there is any problem in the article, please ask everyone to raise it.

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That's all for today's sharing.

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翻译：百度翻译

参考：《零基础入门学习C语言：带你学C带你飞》、哔哩哔哩小甲鱼视频、网络图片

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