C Program to Count the Occurrences of Elements in a Linked List using Recursion

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 to find the number of occurrences of a given number in a list. The C Program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C program to find the number of occurences of a given number in a

```
 * list
```
```
 */
```
```
#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("Printing the list:\n");
```
```
    for (i = 0; i < size; i++)
```
```
    {
```
```
        list[i] = rand() % size;
```
```
        printf("%d    ", list[i]);
```
```
    }
```

    printf("\nEnter the key to find it's occurence: ");

```
    scanf("%d", &key);
```
```
    occur(list, size, 0, key, &count);
```

    printf("%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);

```
}
```

$ cc pgm13.c
$ a.out
Enter the size of the list: 7
Printing the list:
1    4    2    5    1    3    3
Enter the key to find it's occurence: 3
3 occurs for 2 times.

Sanfoundry Global Education & Learning Series – 1000 C Programs.

Here’s the list of Best Books in C Programming, Data-Structures and Algorithms

If you wish to look at other example programs on Linked List, go to Linked List. If you wish to look at programming examples on all topics, go to C Programming Examples.

« Prev - C Program to Count the Occurrences of Elements in a Linked List without Recursion

» Next - C Program to Reverse a Linked List without Recursion

Related Posts:

Apply for Information Technology Internship
Check Data Structure Books
Check Programming Books
Practice Computer Science MCQs
Apply for Data Structure Internship

Recommended Articles: