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C > Linked Lists Code Examples

Count the Number of Occurrences of an Element in the Linked List using Recursion

Count the Number of Occurrences of an Element in the 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.

    #include <stdio.h>

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

    int main()

    {

        int size, key, count = 0;

        int list[20];

        int j;

        printf("Enter the size of the list: ");

        scanf("%d", &size);

        printf("Printing the list:\n");

        for (j = 0; j < size; j++)

        {

            list[j] = rand() % size;

            printf("%d    ", list[j]);

        }

        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);

    }

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