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枚举 与 枚举的应用

2024-07-10 06:02:42   215人阅读

 

 枚举 1
# include <stdio.h>//只定义了一个数据类型，并没有定义变量， 该数据类型的名字是 enum WeekDay , 默认 值是用0开始// MonDay = 0 , TuesDay = 1 .... , SunDay = 6enum WeekDay{    MonDay, TuesDay, WednesDay, ThursDay, FriDay, SaturDay, SunDay};int main(void){    //int day; //day定义成int类型不合适    enum WeekDay day = SunDay;    printf("%d\n", day);    return 0;}

 

 枚举 2

# include <stdio.h>//只定义了一个数据类型，并没有定义变量， 该数据类型的名字是 enum WeekDay , 值是用A的ASC2码开始// MonDay = 65 , TuesDay = 66 ....  enum WeekDay{    MonDay = ‘A‘, TuesDay, WednesDay, ThursDay, FriDay, SaturDay, SunDay};int main(void){    //int day; //day定义成int类型不合适    enum WeekDay day = SunDay;    printf("%d\n", day);    return 0;}

 

 

 

对枚举的应用
/*    对枚举的应用!*/# include <stdio.h>enum weekday{    MonDay, TuesDay, WednesDay, ThursDay, FriDay, SaturDay, SunDay //考虑将WednesDay改为WednesDay = 5之后，MonDay与SunDay的值是多少？};void f(enum weekday i) //本函数的目的只是期望接受0～6之间的数字，将形参i定义为枚举型，可以有效的避免传参失误的问题{    switch (i)    {    case 0:        printf("MonDay!\n");        break;    case 1:        printf("TuesDay!\n");        break;    case 2:        printf("WednesDay!\n");        break;    case 3:        printf("ThursDay!\n");        break;    case 4:        printf("FriDay!\n");        break;    case 5:        printf("SaturDay!\n");        break;    case 6:        printf("SunDay!\n");        break;      }          }int main(void){    f(FriDay); //虽然FriDay本质上就是5，但直接写成f(5);就是错的， 也不能写成f(10); 考虑为什么！ 嘿嘿    return 0;}

 

 

 

 


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