在C中使用枚举

Question

我有这个枚举：

  enum Seasons{
  winter,spring,summer,autumn
  };

该代码将做什么？

 enum Seasons curr_season;
 curr_season = autumn;
 curr_season = 19;

谢谢！

Answer 1

enum Seasons{
    winter,spring,summer,autumn
};

上面创建了以下内容

winter=0, spring=1, summer=2 and autumn=3

注意： enums只是整数！ ..也可以取负数！

enum Seasons curr_season;
curr_season = autumn;
/* curr_season will now have 3 assigned */

curr_season = 19;
/* curr_season will now have 19 assigned */

您可以运行以下代码进行检查！

#include <stdio.h>

enum Seasons{
        winter,spring,summer,autumn
};

void print_seanons(void)
{
    printf("winter = %d \n", winter);
    printf("spring = %d \n", spring);
    printf("summer = %d \n", summer);
    printf("autumn = %d \n", autumn);
    return;
}

int main(void)
{
    enum Seasons curr_season;
    print_seanons();

    curr_season = autumn;
    printf("curr_season = %d \n", curr_season);
    curr_season = 19; 
    printf("curr_season = %d \n", curr_season);
    return 0;

}

Answer 2

枚举常量在c中的类型为int 。 尽管enum并非显式为int类型，但枚举类型和int之间的转换是静默的。 通常没有对枚举的约束检查，因此您的代码在功能上等效于：

int curr_season;
curr_season = 3;
curr_season = 19;

Answer 3

枚举是整数值，因此它将为curr_season分配值19。

交叉使用（将整数值分配给枚举）被认为是不良的编程习惯，应避免使用。