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DataStructure-Program to copy one linked list into another using recursion.

#include <stdio.h>
#include <conio.h>
#include <alloc.h>
/* structure containing a data part and link part */
struct node
{
int data ;
struct node *link ;
} ;
void append ( struct node **, int ) ;
void copy ( struct node *, struct node ** ) ;
void display ( struct node * ) ;
void main( )
{
struct node *first, *second ;
first = second = NULL ; /* empty linked lists */
append ( &first, 1 ) ;
append ( &first, 2 ) ;
append ( &first, 3 ) ;
append ( &first, 4 ) ;
append ( &first, 5 ) ;
append ( &first, 6 ) ;
append ( &first, 7 ) ;
clrscr( ) ;
display ( first ) ;
copy ( first, &second ) ;
display ( second ) ;
}
/* adds a node at the end of the linked list */
void append ( struct node **q, int num )
{
struct node *temp ;
temp = *q ;
if ( *q == NULL ) /* if the list is empty, create first node */
{
*q = malloc ( sizeof ( struct node ) ) ;
temp = *q ;
}
else
{
/* go to last node */
while ( temp -> link != NULL )
temp = temp -> link ;
/* add node at the end */
temp -> link = malloc ( sizeof ( struct node ) ) ;
temp = temp -> link ;
}
/* assign data to the last node */
temp -> data = num ;
temp -> link = NULL ;
}
/* copies a linked list into another */
void copy ( struct node *q, struct node **s )
{
if ( q != NULL )
{
*s = malloc ( sizeof ( struct node ) ) ;
( *s ) -> data = q -> data ;
( *s ) -> link = NULL ;
copy ( q -> link, &( ( *s ) -> link ) ) ;
}
}
/* displays the contents of the linked list */
void display ( struct node *q )
{
printf ( "\n" ) ;
/* traverse the entire linked list */
while ( q != NULL )
{
printf ( "%d ", q -> data ) ;
q = q -> link ;
}
}

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