// Source: "Software Design ...", John A Robinson, Newnes, 2004, page 147.
#include "loc.h"
enum { nfrigid, ntemperate, torrid, stemperate, sfrigid, error };
const char *zones[6] = {
      "North frigid",
      "North temperate",
      "Torrid",
      "South temperate",
      "South frigid",
      "None"         // Flag to indicate error return
      };
const char *location::zone() const
      {
      if (!name[0])       // No location loaded in this object
            return zones[error]; // Error return
      if (latitude < 23.5)
            return zones[torrid];
      if (latitude < 66.5)
            {
            if (ns == 'N')
                  return zones[ntemperate];
             return zones[stemperate];
             }
      if (ns == 'N')
             return zones[nfrigid];
      return zones[sfrigid];
      }