C Program Count Occurrence of Element in Linked List using Recursion

By | 29.11.2016

Count Occurrence of Element


Write a C Program Count Occurrence of Element in Linked List using Recursion. Here’s simple C Program Count Occurrence of Element in 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 & finds the occurrence for an element in an unsorted list. The user enters the element need to be counted.

Here is the source code of the C Program Count Occurrence of Element in 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 Count Occurrence of Element in Linked List using Recursion  */

#include <stdio.h>

void occur(int [], int, int, int, int *);

int main()
{
    int size, key, count = 0;
    int list[20];
    int i;

    printf("Enter the size of the list: ");
    scanf("%d", &size);
    printf("\nPrinting the list :: \n\n");
    for (i = 0; i < size; i++)
    {
        list[i] = rand() % size;
        printf("%d    ", list[i]);
    }
    printf("\n\nEnter the key to find it's occurrence: ");
    scanf("%d", &key);
    occur(list, size, 0, key, &count);
    printf("\n%d occurs for %d times.\n", key, count);
    return 0;
}

void occur(int list[], int size, int index, int key, int *count)
{
    if (size == index)
    {
        return;
    }
    if (list[index] == key)
    {
        *count += 1;
    }
    occur(list, size, index + 1, key, count);
}

 


Output : :


/*  C Program Count Occurrence of Element in Linked List using Recursion  */

Enter the size of the list: 8

Printing the list ::

1    3    6    4    1    4    6    6

Enter the key to find it's occurrence: 6

6 occurs for 3 times.

Process returned 0

Above is the source code for C Program Count Occurrence of Element in 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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