Write a C Program Find Length of Linked List using Recursion

By | 29.11.2016

Find Length of Linked List using Recursion


Write a C Program Find Length of Linked List using Recursion. Here’s simple Program Find Length of Linked List using Recursion in C Programming Language.


Recursion : :


  • Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.
  • The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.
  • Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

Problem : :


This C Program uses recursive function & counts the number of nodes in a linked list. A linked list is an ordered set of data elements, each containing a link to its successor.

Here is the source code of the C Program Find Length of Linked List using Recursion. The C Program is successfully compiled and run on a Linux system. The program output is also shown below.


SOURCE CODE : :


/*  C Program Find Length of Linked List using Recursion  */

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

struct node
{
    int a;
    struct node *next;
};

void generate(struct node **,int size);
int length(struct node*);
void delete(struct node **);
void display(struct node *head);

int main()
{
    struct node *head = NULL;
    int count,size;

    printf("Enter size  of List u want to Generate :: ");
    scanf("%d",&size);

    generate(&head,size);
    display(head);
    count = length(head);
    printf("\nThe number of nodes are : %d \n", count);
    delete(&head);
    return 0;
}

void generate(struct node **head,int size)
{
    /* for unknown number of nodes use size = rand() % 20; */
    int i;
    struct node *temp;

    for (i = 0; i < size; i++)
    {
        temp = (struct node *)malloc(sizeof(struct node));
        temp->a = i;
        if (*head == NULL)
        {
            *head = temp;
            (*head)->next = NULL;
        }
        else
        {
            temp->next = *head;
            *head = temp;
        }
    }
}

void display(struct node *head)
{
    printf("\nThe Generated List is :: \n\n");
    while(head!=NULL)
    {
        if(head->next==NULL)
        {
             printf("%d",head->a);
        }
        else
        {
             printf("%d--> ",head->a);
        }
        head=head->next;
    }

    printf("\n");
}

int length(struct node *head)
{
    if (head->next == NULL)
    {
        return 1;
    }
    return (1 + length(head->next));
}

void delete(struct node **head)
{
    struct node *temp;
    while (*head != NULL)
    {
        temp = *head;
        *head = (*head)->next;
        free(temp);
    }
}

Output : :


/*  C Program Find Length of Linked List using Recursion  */

Enter size  of List u want to Generate :: 10

The Generated List is ::

9--> 8--> 7--> 6--> 5--> 4--> 3--> 2--> 1--> 0

The number of nodes are : 10

Process returned 0

Above is the source code for C Program Find Length of Linked List using Recursion which is successfully compiled and run on Windows System.The Output of the program is shown above .

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About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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