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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