如何在C中定义枚举类型（枚举）？ [英] How to define an enumerated type (enum) in C?

问题描述

我不知道使用C枚举的正确语法是什么。我有以下代码：

I'm not sure what is the proper syntax for using C enums. I have the following code:

enum {RANDOM, IMMEDIATE, SEARCH} strategy;
strategy = IMMEDIATE;

但是这不能编译，出现以下错误：

But this does not compile, with the following error:

error: conflicting types for ‘strategy’
error: previous declaration of ‘strategy’ was here

我做错了什么？

推荐答案

声明枚举变量是这样完成的：

Declaring an enum variable is done like this:

enum strategy {RANDOM, IMMEDIATE, SEARCH};
enum strategy my_strategy = IMMEDIATE;

但是，您可以使用 typedef 缩短变量声明，如下所示：

However, you can use a typedef to shorten the variable declarations, like so:

typedef enum {RANDOM, IMMEDIATE, SEARCH} strategy;
strategy my_strategy = IMMEDIATE;

有一个命名约定来区分类型和变量是个好主意：

Having a naming convention to distinguish between types and variables is a good idea:

typedef enum {RANDOM, IMMEDIATE, SEARCH} strategy_type;
strategy_type my_strategy = IMMEDIATE;

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