C Programming Code Examples
C > Recursion 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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