c#枚举类型

Using the typedef and enum keywords we can define a type that can have either one value or another.

使用typedef和enum关键字，我们可以定义一个可以具有一个值或另一个值的类型。

It’s one of the most important uses of the typedef keyword.

这是typedef关键字最重要的用途之一。

This is the syntax of an enumerated type:

这是枚举类型的语法：

typedef enum {  //...values} TYPENAME;

The enumerated type we create is usually, by convention, uppercase.

按照惯例，我们创建的枚举类型通常是大写的。

Here is a simple example:

这是一个简单的示例：

typedef enum {  true,  false} BOOLEAN;

C comes with a , so this example is not really practical, but you get the idea.

C带有 ，因此该示例并不实际，但您可以理解。

Another example is to define weekdays:

另一个示例是定义工作日：

typedef enum {  monday,    tuesday,  wednesday,  thursday,  friday,  saturday,  sunday} WEEKDAY;

Here’s a simple program that uses this enumerated type:

这是使用此枚举类型的简单程序：

#include 
     
      typedef enum {  monday,    tuesday,  wednesday,  thursday,  friday,  saturday,  sunday} WEEKDAY;int main(void) {  WEEKDAY day = monday;    if (day == monday) {    printf("It's monday!");   } else {    printf("It's not monday");   }}
     

Every item in the enum definition is paired to an integer, internally. So in this example monday is 0, tuesday is 1 and so on.

枚举定义中的每个项目都在内部与一个整数配对。 因此，在此示例中， monday为0， tuesday为1，依此类推。

This means the conditional could have been if (day == 0) instead of if (day == monday), but it’s way simpler for us humans to reason with names rather than numbers, so it’s a very convenient syntax.

这意味着条件可以是if (day == 0)而不是if (day == monday) ，但是对于我们人类来说，使用名称而不是数字来进行推理更简单，因此这是一种非常方便的语法。

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c#枚举类型