typedef struct vs struct definitions [重复]

本文翻译自：typedef struct vs struct definitions [duplicate]

This question already has an answer here: 这个问题已经在这里有了答案：

• Why should we typedef a struct so often in C? 为什么要在C语言中这么频繁地对结构进行typedef？ 15 answers 15个答案

I'm a beginner in C programming, but I was wondering what's the difference between using typedef when defining a structure versus not using typedef . 我是C编程的初学者，但我想知道在定义结构时使用typedef与不使用typedef什么区别。 It seems to me like there's really no difference, they accomplish the same goal. 在我看来，它们之间并没有什么区别，它们实现了相同的目标。

struct myStruct{
    int one;
    int two;
};

vs. 与

typedef struct{
    int one;
    int two;
}myStruct;

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#1楼

参考：https://stackoom.com/question/71pn/typedef-struct-vs-struct-definitions-重复

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#2楼

The following code creates an anonymous struct with the alias myStruct : 以下代码创建一个别名为myStruct的匿名结构：

typedef struct{
    int one;
    int two;
} myStruct;

You can't refer it without the alias because you don't specify an identifier for the structure. 没有别名，就不能引用它，因为您没有为结构指定标识符。

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#3楼

The typedef , as it is with other constructs, is used to give a data type a new name. 与其他构造一样， typedef用于为数据类型赋予新名称。 In this case it is mostly done in order to make the code cleaner: 在这种情况下，通常是为了使代码更整洁：

struct myStruct blah;

vs. 与

myStruct blah;

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#4楼

In C (not C++), you have to declare struct variables like: 在C（不是C ++）中，您必须声明结构变量，例如：

struct myStruct myVariable;

In order to be able to use myStruct myVariable; 为了能够使用myStruct myVariable; instead, you can typedef the struct: 相反，您可以typedef结构：

typedef struct myStruct someStruct;
someStruct myVariable;

You can combine struct definition and typedef s it in a single statement which declares an anonymous struct and typedef s it. 您可以将struct定义和typedef组合在一个声明匿名struct和typedef的语句中。

typedef struct { ... } myStruct;

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#5楼

The difference comes in when you use the struct . 使用struct时会有所不同。

The first way you have to do: 您必须做的第一种方式：

struct myStruct aName;

The second way allows you to remove the keyword struct . 第二种方法允许您删除关键字struct 。

myStruct aName;

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#6楼

If you use struct without typedef , you'll always have to write 如果使用不带typedef struct ，则始终必须编写

struct mystruct myvar;

It's illegal to write 写是非法的

mystruct myvar;

If you use the typedef you don't need the struct prefix anymore. 如果使用typedef ，则不再需要struct前缀。