Dictionary

/* Dictionary */

Problem Statement

Write a program to simulate a dictionary using linked list. It should be a menu driven program with the options for adding a word and its meanings, searching a word and displaying the dictionary. Steps to develop the program are as given below:

1. Declare a structure with the fields as
- a word,
- meaning of a word
- counter that holds the number of meanings
- link to the next node.

Each word added to the list can have maximum 5 meaning(s). Hence, variable used to store meaning(s) of a word would be a two dimensional character array.

2. The program should have following menu.

- Add a word
- Search for a word
- Show dictionary
- Exit

#include <stdio.h>
#include <conio.h>
#include <malloc.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

struct node
{
char data [ 20 ] ;
char m [ 5 ] [ 20 ] ;
int mcount ;
struct node * link ;
} ;

struct node * dic [ 26 ] ;

void add ( char * ) ;
int search ( char * ) ;
void show( ) ;
void deldic( ) ;

void main( )
{
char word [ 20 ] , ch ;
int i ;

clrscr( ) ;

while ( 1 )
{
clrscr( ) ;
printf ( "\n\t\tDictionary\n" ) ;
printf ( "\n\t\t1.Add Word.\n" ) ;
printf ( "\t\t2.Search Word.\n" ) ;
printf ( "\t\t3.Show Dictionary.\n" ) ;
printf ( "\t\t0.Exit." ) ;
printf ( "\n\n\t\tYour Choice ") ;
scanf ( "%d", &ch ) ;

switch ( ch )
{
case 1 :

printf ( "\nEnter any word : " ) ;
fflush ( stdin ) ;
gets ( word ) ;
add ( word ) ;

break ;

case 2 :

printf ( "\nEnter the word to search : " ) ;
fflush ( stdin ) ;
gets ( word ) ;
i = search ( word ) ;
if ( ! i )
printf ( "Word does not exists." ) ;
getch( ) ;

break ;

case 3 :

show( ) ;
getch( ) ;

break ;

case 0 :

deldic( ) ;
exit ( 0 ) ;

default :

printf ( "\nWrong Choice" ) ;
}
}
}

void add ( char * str )
{
int i, j = toupper ( str [ 0 ] ) - 65 ;
struct node * r, * temp = dic [ j ], * q ;
char mean [ 5 ] [ 20 ], ch = 'y' ;

i = search ( str ) ;
if ( i )
{
printf ( "\nWord already exists." ) ;
getch( ) ;
return ;
}
q = ( struct node * ) malloc ( sizeof ( struct node ) ) ;
strcpy ( q -> data, str ) ;
q -> link = NULL ;

for ( i = 0 ; tolower ( ch ) == 'y' && i < 5 ; i++ )
{
fflush ( stdin ) ;
printf ( "\n\nEnter the meaning(s) : " ) ;
gets ( mean [ i ] ) ;
strcpy ( q -> m [ i ] , mean [ i ] ) ;
if ( i != 4 )
printf ( "\nAdd more meanings (y/n) " ) ;
else
printf ( "You cannot enter more than 5 meanings." ) ;
fflush ( stdin ) ;
ch = getche( ) ;
}

q -> mcount = i ;
if ( dic [ j ] == NULL || strcmp ( dic [ j ] -> data, str ) > 0 )
{
r = dic [ j ] ;
dic [ j ] = q ;
q -> link = r ;
return ;
}

else
{
while ( temp != NULL )
{
if ( ( strcmp ( temp -> data, str ) < 0 ) && ( ( strcmp ( temp -> link -> data, str ) > 0 ) ||
temp -> link == NULL ) )
{
q -> link = temp -> link ;
temp -> link = q ;
return ;
}
temp = temp -> link ;
}
}
}

int search ( char *str )
{
struct node *n ;
char temp1 [ 20 ] ;
char temp2 [ 20 ] ;
int i ;

n = dic [ toupper ( str [ 0 ] ) - 65 ] ;
strcpy ( temp2, str ) ;
strupr ( temp2 ) ;

while ( n != NULL )
{
strcpy ( temp1, n -> data ) ;

if ( strcmp ( strupr ( temp1 ), temp2 ) == 0 )
{
printf ( "\n%s\t\t%s", n -> data, n -> m [ 0 ] ) ;
for ( i = 1 ; i < n -> mcount ; i++ )
printf ( "\n\t\t%s", n -> m [ i ] ) ;
return 1 ;
}
n = n -> link ;
}
return 0 ;
}

void show( )
{
struct node *n ;
int i, j ;

printf ( "Word\t\tMeaning\n" ) ;
for ( i = 0 ; i <= 30 ; i++ )
printf ( "-" ) ;

for ( i = 0 ; i <= 25 ; i++ )
{
n = dic [ i ] ;
while ( n != NULL )
{
printf ( "\n%s\t\t%s", n -> data, n -> m [ 0 ] ) ;
for ( j = 1 ; j < n -> mcount ; j++ )
printf ( "\n\t\t%s", n -> m [ j ] ) ;
n = n -> link ;
}
}
}

void deldic( )
{
struct node *n, *t ;
int i ;

for ( i = 0 ; i <= 25 ; i++ )
{
n = dic [ i ] ;
while ( n != NULL )
{
t = n -> link ;
free ( n ) ;
n = t ;
}
}
}