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

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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.

  1. /*
  2.  * C program to find the number of occurences of a given number in a 
  3.  * list
  4.  */
  5. #include <stdio.h>
  6.  
  7. void occur(int [], int, int, int, int *);
  8.  
  9. int main()
  10. {
  11.     int size, key, count = 0;
  12.     int list[20];
  13.     int i;
  14.  
  15.     printf("Enter the size of the list: ");
  16.     scanf("%d", &size);
  17.     printf("Printing the list:\n");
  18.     for (i = 0; i < size; i++)
  19.     {
  20.         list[i] = rand() % size;
  21.         printf("%d    ", list[i]);
  22.     }
  23.     printf("\nEnter the key to find it's occurence: ");
  24.     scanf("%d", &key);
  25.     occur(list, size, 0, key, &count);
  26.     printf("%d occurs for %d times.\n", key, count);
  27.     return 0;
  28. }
  29.  
  30. void occur(int list[], int size, int index, int key, int *count)
  31. {
  32.     if (size == index)
  33.     {
  34.         return;
  35.     }
  36.     if (list[index] == key)
  37.     {
  38.         *count += 1;
  39.     }
  40.     occur(list, size, index + 1, key, count);
  41. }

$ 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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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.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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