days-1.c - En enumeration type enum days og en funktion next_day_of.

Lektion 5 - slide 7 : 24 Program 1

enum days {sunday, monday, tuesday, wednesday, thursday, 
           friday, saturday};

enum days  next_day_of(enum days  d){
  enum days next_day;
  switch (d){
    case sunday: next_day = monday; 
      break;
    case monday: next_day = tuesday;
      break;
    case tuesday: next_day = wednesday;
      break;
    case wednesday: next_day = thursday;
      break;
    case thursday: next_day = friday;
      break;
    case friday: next_day = saturday;
      break;
    case saturday: next_day = sunday;
      break;
  }
  return next_day;
}