# include <stdio.h>
# include <stdbool.h>
//
//  Program 10.9, Stephen Kochan, Programming in C.
//
struct entry
{
  char word[15];
  char definition[50];
};

int main ( void );
bool equalStrings ( const char s1[], const char s2[] );
int lookup ( const struct entry dictionary[], const char search[], const int entries );

int main ( void )
{
  const struct entry dictionary[100] = 
  {
    { "aardvark", "a burrowing African mammal"        },
    { "abyss",    "a bottomless pit"                  },
    { "acumen",   "mentally sharp, keen"              },
    { "addle",    "to become confused"                },
    { "aerie",    "a high nest"                       },
    { "affix",    "to append or attach"               },
    { "agar",     "a jelly made from seaweed"         },
    { "ahoy",     "a nautical call of greeting"       },
    { "aigrette", "an ornamental cluster of feathers" },
    { "ajar",     "partially open"                    }
  };
  char word[15];
  int entries = 10;
  int entry;

  printf ( "Enter word: " );
  scanf ( "%14s", word );
  entry = lookup ( dictionary, word, entries );

  if ( entry != -1 )
  {
    printf ( "%s\n", dictionary[entry].definition );
  }
  else
  {
    printf ( "Sorry, the word %s is not in my dictionary.\n", word );
  }
  return 0;
}

int lookup ( const struct entry dictionary[], const char search[], const int entries )
{
  int i;

  for ( i = 0; i < entries; i++ )
  {
    if ( equalStrings ( search, dictionary[i].word ) )
    {
      return i;
    }
  }
  return -1;
}

bool equalStrings ( const char s1[], const char s2[] )
{
  int i = 0;
  bool areEqual;

  while ( s1[i] == s2[i] && s1[i] != '\0' && s2[i] != '\0' )
  {
    i = i + 1;
  }

  if ( s1[i] == '\0' && s2[i] == '\0' )
  {
    areEqual = true;
  }
  else
  {
    areEqual = false;
  }

  return areEqual;
}