编辑代码

#include <stdio.h>
#include <stdio.h>
void main()
{
    enum weekday {mon,tue,wed,thu,fri,sat,sun} day;
    int count1=0,count2=0;
    for(day=mon;day<=sun;day++){
        switch(day){
            case mon: case tue: case wed: case thu: case fri:
                count1++;break;
            case sat: case sun:
                count2++;break;
            default: break;
        }
    }
    printf("A week includes %d workday, and %d weekend. \n",count1, count2);
}  

// day=(enum weekday)(day+1)也可以