enum举例

#include<stdio.h>

#include<string.h>

enum day{sun=0,mon,tue,wed,thu,fri,sat};

enum day tomorrow(enum day d)

{

  enum day nd;  switch(d)

 {  

    case sun: nd=mon;break;   

    case mon: nd=tue;break;

    case tue: nd=wed;break;

    case wed: nd=thu;break;   

    case thu: nd=fri;break;

    case fri: nd=sat;break;   

    case sat: nd=sun;break;

  }

   return (nd);

}

int main()

{    

enum day xx,yy;   

    char str[5];  

    printf("please input current date:");  

    scanf("%s",str);

    if(strcmp(str,"sun")==0)xx=sun;

    else if(strcmp(str,"mon")==0)xx=mon;  

    else if(strcmp(str,"tue")==0)xx=tue;   

    else if(strcmp(str,"wed")==0)xx=wed;   

    else if(strcmp(str,"thu")==0)xx=thu;   

    else if(strcmp(str,"fri")==0)xx=fri;   

    else if(strcmp(str,"sat")==0)xx=sat;   

    yy=tomorrow(xx);  

      switch(yy)  

       {     

          case sun:printf("tomorrow is sun\n");break;   

          case mon:printf("tomorrow is mon\n");break;

          case tue:printf("tomorrow is tue\n");break;   

          case  wed:printf("tomorrow is wed\n");break;   

          case thu:printf("tomorrow is thu\n");break;    

          case fri:printf("tomorrow is fri\n");break;  

          case sat:printf("tomorrow is sat\n");break;    

        }    

      return 0;

     }