枚举，一种构造类型，用于声明一组命名的常数，当一个变量有几种可能的取值时，可以将它定义为枚举类型。

枚举的目的就是提高程序的可读性；

枚举的特殊属性:

初始化一个枚举类型：

enum day {Sun=0,Mon,Tue,Wed,Thu,Fri,Sat};

定义Sun为0，后面的Mon Tue Wed 就为1 2 3

enum day {Sun,Mon=10,Tue,Wed,Thu,Fri,Sat};

此时Sun为0 Mon=10 Tue=11 Wed=12·······

 

1 #include
     
       2 #include
      
        3 #include
       
         4 enum day {Sun=0,Mon,Tue,Wed,Thu,Fri,Sat}; 5 const char * dds[] = {
   "Sun","Mon","Tue","Wed","Thu","Fri","Sat"}; 6 int main(void) 7 { 8     enum day dd,yy; 9     char days[5];10     printf("please input one day:\n");11     fgets(days,4,stdin);12         for(dd=Sun; dd<=Sat; dd++)13         {14             if(strcmp(days,dds[dd])==0)　　//比较字符串15             {16                 break;17             }18         }19         switch(dd)20         {21             case Sun:printf("tomorrow is mon\n"); break;22             case Mon:printf("tomorrow is tue\n"); break;23             case Tue:printf("tomorrow is wed\n"); break;24             case Wed:printf("tomorrow is thu\n"); break;25             case Thu:printf("tomorrow is fri\n"); break;26             case Fri:printf("tomorrow is sat\n"); break;27             case Sat:printf("tomorrow is sun\n"); break;28         }29     30 }