Write a C Program to count occurrences of element in single linked list

By | March 29, 2017

C Program to count occurrences of element in single linked list


Write a C Program to count occurrences of element in single linked list. Here’s simple Menu Driven Program to count occurrences of element in single linked list in C Programming Language.


What is Linked List ?


Linked list is a linear data structure that contains sequence of elements such that each element links to its next element in the sequence. Each link contains a connection to another link.

Following are the important terms to understand the concept of Linked List.

  • Link − Each link of a linked list can store a data called an element.
  • Next − Each link of a linked list contains a link to the next link called Next.

Each element in a linked list is called as “Node”. Each node consists of its own data and the address of the next node and forms a chain. Linked Lists are used to create trees and graphs.


Below is the source code for C Program to count occurrences of element in single linked list which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/* C Program to count occurrences of element in single linked list */


#include<stdio.h>
#include<stdlib.h>

struct node
{
	int info;
	struct node *link;
};

struct node *create_list(struct node *start);
void display(struct node *start);
struct node *addatbeg(struct node *start,int data);
struct node *addatend(struct node *start,int data);
int countOccurrences(struct node *start, int n);

int main()
{
	struct node *start=NULL;
	int n;

	start=create_list(start);
	display(start);

	printf("\nEnter element to count occurrences : ");
	scanf("%d",&n);
	printf("\nThe element %d occurs %d times\n",n,countOccurrences(start,n) );

	return 0;

}/*End of main()*/

int countOccurrences(struct node *ptr, int n)
{
	int k=0;
	while(ptr!=NULL)
	{
		if(ptr->info == n)
			k++;
		ptr=ptr->link;
	}
	return k;
}/*End of countOccurrences()*/


struct node *create_list(struct node *start)
{
	int i,n,data;
	printf("Enter the number of nodes u want : ");
	scanf("%d",&n);
	start=NULL;
	if(n==0)
		return start;

	printf("\nEnter the element to be inserted : ");
	scanf("%d",&data);
	start=addatbeg(start,data);

	for(i=2;i<=n;i++)
	{
		printf("Enter the element to be inserted : ");
		scanf("%d",&data);
		start=addatend(start,data);
	}
	return start;
}/*End of create_list()*/

void display(struct node *start)
{
	struct node *p;
	if(start==NULL)
	{
		printf("\nList is empty\n");
		return;
	}
	p=start;
	printf("\nList is :\n");
	while(p!=NULL)
	{
		printf("%d ",p->info);
		p=p->link;
	}
	printf("\n\n");
}/*End of display() */

struct node *addatbeg(struct node *start,int data)
{
	struct node *tmp;
	tmp=(struct node *)malloc(sizeof(struct node));
	tmp->info=data;
	tmp->link=start;
	start=tmp;
	return start;
}/*End of addatbeg()*/

struct node *addatend(struct node *start,int data)
{
	struct node *p,*tmp;
	tmp=(struct node *)malloc(sizeof(struct node));
	tmp->info=data;
	p=start;
	while(p->link!=NULL)
		p=p->link;
	p->link=tmp;
	tmp->link=NULL;
	return start;
}/*End of addatend()*/


OUTPUT : :


/* C Program to count occurrences of element in single linked list */

**************** OUTPUT ********************

Enter the number of nodes u want : 10

Enter the element to be inserted : 2
Enter the element to be inserted : 5
Enter the element to be inserted : 7
Enter the element to be inserted : 3
Enter the element to be inserted : 2
Enter the element to be inserted : 6
Enter the element to be inserted : 7
Enter the element to be inserted : 2
Enter the element to be inserted : 1
Enter the element to be inserted : 2

List is :
2 5 7 3 2 6 7 2 1 2


Enter element to count occurrences : 2

The element 2 occurs 4 times

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