C Program to split list such that alternate nodes go to different lists

By | 08.04.2017

Split list s.t alternate nodes go to different lists


Write a C Program to split list into two lists such that alternate nodes go to different lists. Here’s simple Program to split list into two lists  such that alternate nodes go to different list 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 split list into two lists such that alternate nodes go to different lists which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/* C Program to split list such that alternate nodes go to different 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);
struct node *AlternateSplit(struct node *start1);

int main()
{
        struct node *start1=NULL,*start2=NULL, *start3=NULL;

        start1=create_list(start1);
        printf("\nOriginal list is :\n");
        display(start1);

        start2 = AlternateSplit(start1);

        printf("\nList 1 is :\n");
        display(start1);
        printf("\nList 2 is :\n");
        display(start2);

        return 0;

}/*End of main()*/

struct node *AlternateSplit(struct node *start1 )
{
        struct node *prev,*ptr,*start2;

        if(start1==NULL)
                return 0;

        start2 = start1->link;

        prev=start1;
        ptr=start1->link;

        while( ptr!=NULL )
        {
                prev->link = ptr->link;
                prev=prev->link;
                if(prev==NULL)
            ptr->link=NULL;
                else
                        ptr->link = prev->link;
                ptr = ptr->link;
        }
        return start2;
}/*End of AlternateSplit()*/

struct node *create_list(struct node *start)
{
        int i,n,data;
        printf("Enter 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("Empty\n");
                return;
        }
        p=start;

        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 split list such that alternate nodes go to different lists */

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


Enter the number of nodes : 8

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 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

Original list is :
1 2 3 4 5 6 7 8


List 1 is :
1 3 5 7


List 2 is :
2 4 6 8

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