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Program 1

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

/* Tedious function. An alternative version appears later in this lecture */
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;
}