C Program to Concatenate two singly linked lists

Write a C Program to Concatenate two singly linked lists. Here’s simple Menu Driven Program to Concatenate two singly 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.

Basic Operations

Following are the basic operations supported by a list.

• Insertion − Adds an element at the beginning of the list.
• Deletion − Deletes an element at the beginning of the list.
• Display − Displays the complete list.
• Search − Searches an element using the given key.
• Delete − Deletes an element using the given key.

Below is the source code for C Program to Concatenate two singly linked lists which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/* C Program to Concatenate two singly linked lists*/


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

struct node
{
        int info;
        struct node *link;
};
struct node *create_list(struct node *);
struct node *concat( struct node *start1,struct node *start2);
struct node *addatbeg(struct node *start, int data);
struct node *addatend(struct node *start,int data);
void display(struct node *start);

int main()
{
        struct node *start1=NULL,*start2=NULL;
        start1=create_list(start1);
        start2=create_list(start2);
        printf("\nFirst list is  : ");
        display(start1);
        printf("\nSecond list is  : ");
        display(start2);
    start1=concat(start1, start2);
        printf("\nConcatenated list is  : ");
        display(start1);

        return 0;

}/*End of main()*/

struct node *concat( struct node *start1,struct node *start2)
{
        struct node *ptr;
        if(start1==NULL)
        {
                start1=start2;
                return start1;
        }
        if(start2==NULL)
                return start1;
        ptr=start1;
        while(ptr->link!=NULL)
                ptr=ptr->link;
        ptr->link=start2;
        return start1;
}
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("Enter the element to be inserted : ");
        scanf("%d",&data);
        start=addatbeg(start,data);

        for(i=2;i<=n;i++)
        {
                printf("Enter 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;
        while(p!=NULL)
        {
                printf("%d ", p->info);
                p=p->link;
        }
        printf("\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 Concatenate two singly linked lists*/

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


Enter the number of nodes : 5
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 number of nodes : 5
Enter the element to be inserted : 6
Enter the element to be inserted : 7
Enter the element to be inserted : 8
Enter the element to be inserted : 9
Enter the element to be inserted : 0

First list is  : 1 2 3 4 5

Second list is  : 6 7 8 9 0

Concatenated list is  : 1 2 3 4 5 6 7 8 9 0

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