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

问题描述

我不确定使用 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;

但这不会编译，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

声明一个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 来缩短变量声明，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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