#include "library.h"

const string animals[] =
 {    "aardvark",     "albatross",     "alligator",        "amoeba",
           "ant",      "anteater",      "antelope",     "armadillo",
        "baboon",           "bat",          "bear",           "bee",
        "beetle",     "butterfly",   "caprimulgus",       "caribou",
          "carp",           "cat",   "caterpillar",       "chicken",
    "chimpanzee",           "cod",        "cougar",           "cow",
          "crab",     "crocodile",          "deer",         "dingo",
           "dog",       "dolphin",          "dove",          "duck",
         "eagle",           "eel",      "elephant",           "elk",
        "ferret",      "flamingo",      "flounder",          "frog",
        "gerbil",       "giraffe",           "gnu",          "goat",
      "goldfish",       "gorilla",       "haddock",       "hamster",
          "hawk",      "hedgehog",           "hen",  "hippopotamus",
        "hyaena",        "iguana",       "jackass",      "kangaroo",
         "koala",       "lamprey",         "lemur",       "leopard",
          "lion",         "llama",       "lobster",        "monkey",
         "moose",      "mosquito",          "moth",         "mouse",
      "nematode",          "newt",       "octopus",       "opossum",
     "orangutan",        "osprey",         "otter",           "owl",
         "panda",       "panther",       "peacock",       "penguin",
      "pheasant",        "pigeon",           "pig",     "porcupine",
   "prairie-dog",        "quagga",         "quail",        "rabbit",
        "racoon",           "rat",    "rhinoceros",    "salamander",
    "sea-urchin",      "seahorse",          "seal",       "sealion",
     "semicolon",         "shark",        "shrimp",         "skunk",
         "snake",        "sphynx",        "spider",         "squid",
      "squirrel",      "starfish",      "tapeworm",         "tiger",
      "tortoise",          "tuna",        "turkey",        "turtle",
       "unicorn",       "varmint",          "vole",       "vulture",
        "walrus",       "warthog",        "weasel",        "weevil",
         "whale",     "woodlouse",    "woodpecker",          "worm",
          "yeti",         "zebra",          "zebu" };

int find(const string q, const int minpos, const int maxpos)
{ if (minpos > maxpos)
    return -1;
  const int midpos = (minpos + maxpos) / 2;
  const string seeing = animals[midpos];
  // obviously this cout would not be in a production version.
  cout << "min = " << minpos << ", max = " << maxpos << ", range = " << maxpos - minpos + 1
       << ", mid = " << midpos << ", seeing \"" << seeing << "\"\n";
  if (q == seeing)
    return midpos;
  else if (q < seeing)
    return find(q, minpos, midpos - 1);
  else
    return find(q, midpos + 1, maxpos); }

int find(const string q)
{ const int N = sizeof(animals) / sizeof(string);
  return find(q, 0, N - 1); }

int main()
{ while (true)
  { cout << "animal? ";
    const string x = read_string();
    const int pos = find(x);
    if (pos < 0)
      cout << "\"" << x << "\" not found\n";
    else
      cout << "\"" << animals[pos] << "\" is at position " << pos << "\n"; } }