C Program to Merge alternate nodes of two single linked lists

By | 08.04.2017

Merge alternate nodes of two single linked lists


Write a C Program to Merge alternate nodes of two single linked lists. Here’s simple Program to Merge alternate nodes of two single linked lists in C Programming Language.


What is Linked List ?


Linked list is a linear data structure that contains sequence of elements such that each element links to its next element in the sequence. Each link contains a connection to another link.

Following are the important terms to understand the concept of Linked List.

  • Link − Each link of a linked list can store a data called an element.
  • Next − Each link of a linked list contains a link to the next link called Next.

Each element in a linked list is called as “Node”. Each node consists of its own data and the address of the next node and forms a chain. Linked Lists are used to create trees and graphs.


Below is the source code for C Program to Merge alternate nodes of two single linked lists which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/* C Program to merge alternate nodes of two single linked lists */

#include<stdio.h>
#include<stdlib.h>

struct node
{
        int info;
        struct node *link;
};

struct node *create_list(struct node *start);
void display(struct node *start);
struct node *addatbeg(struct node *start,int data);
struct node *addatend(struct node *start,int data);
void CombineAlternate(struct node **start1, struct node **start2);

int main()
{
        struct node *start1=NULL, *start2=NULL;

        start1=create_list(start1);
        start2=create_list(start2);

        printf("\nFirst  ");
        display(start1);
        printf("\nSecond  ");
        display(start2);

        CombineAlternate(&start1, &start2);

        printf("\nCombined  ");
        display(start1);

        return 0;

}/*End of main()*/

void CombineAlternate(struct node **start1, struct node **start2)
{
        struct node *p1, *p2, *pnext;
        p1=*start1;
        p2=*start2;

        if(p1==NULL) /*If first list is empty*/
        {
                *start1=*start2;
                *start2=NULL;
                return;
        }
        if(p2==NULL) /*If second list is empty*/
                return;
        while(p1->link!=NULL && p2!=NULL)
        {
                pnext = p1->link;
                p1->link = p2;
                p1 = pnext;
                pnext = p2->link;
                p2->link = p1;
                p2=pnext;
        }
        if(p1->link==NULL)
                p1->link = p2;
        *start2=NULL;
}/*End of CombineAlternate()*/

struct node *create_list(struct node *start)
{
        int i,n,data;
        printf("\nEnter the number of nodes : ");
        scanf("%d",&n);
        start=NULL;
        if(n==0)
                return start;

        printf("\nEnter the element to be inserted : ");
        scanf("%d",&data);
        start=addatbeg(start,data);

        for(i=2;i<=n;i++)
        {
                printf("\nEnter the element to be inserted : ");
                scanf("%d",&data);
                start=addatend(start,data);
        }
        return start;
}/*End of create_list()*/

void display(struct node *start)
{
        struct node *p;
        if(start==NULL)
        {
                printf("\nList is empty\n");
                return;
        }
        p=start;
        printf("List is :\n");
        while(p!=NULL)
        {
                printf("%d ",p->info);
                p=p->link;
        }
        printf("\n\n");
}/*End of display() */

struct node *addatbeg(struct node *start,int data)
{
        struct node *tmp;
        tmp=(struct node *)malloc(sizeof(struct node));
        tmp->info=data;
        tmp->link=start;
        start=tmp;
        return start;
}/*End of addatbeg()*/

struct node *addatend(struct node *start,int data)
{
        struct node *p,*tmp;
        tmp=(struct node *)malloc(sizeof(struct node));
        tmp->info=data;
        p=start;
        while(p->link!=NULL)
                p=p->link;
        p->link=tmp;
        tmp->link=NULL;
        return start;
}/*End of addatend()*/

OUTPUT : :


/* C Program to merge alternate nodes of two single linked lists */

************** OUTPUT ****************

Enter the number of nodes : 4

Enter the element to be inserted : 1

Enter the element to be inserted : 2

Enter the element to be inserted : 3

Enter the element to be inserted : 4

Enter the number of nodes : 4

Enter the element to be inserted : 5

Enter the element to be inserted : 6

Enter the element to be inserted : 7

Enter the element to be inserted : 8

First  List is :
1 2 3 4


Second  List is :
5 6 7 8


Combined  List is :
1 5 2 6 3 7 4 8

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