#include<stdio.h>
enum day {sun, mon, tue, wed, thu, fri, sat};
int main()
{
typedef enum day day;
return 0;
}
day find_next_day(day d)
{
day next_day;
switch (d) {
case sun:
next_day = mon;
break;
case mon:
next_day = tue;
break;
case tue:
next_day = wed;
break;
case wed:
next_day = thu;
break;
case thu:
next_day = fri;
break;
case fri:
next_day = sat;
break;
}
return next_day;
}