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: ");

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    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: ");

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    scanf("%d", &key);
```
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    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)
```
```
    {
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```
        return;
```
```
    }
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```
    if (list[index] == key)
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```
    {
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        *count += 1;
```
```
    }
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    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.

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