# Count the number of occurrences of an element in a linked list without using recursion

In this tutorial, we will learn how to find no of occurrences of an element in a linked list without using recursion using the C program? By Piyas Mukherjee Last updated : August 01, 2023

## Input

A singly linked list whose address of the first node is stored in a pointer, say head and key is the data of which we have to count the number of occurrences.

## Output

The number of times key occurred in the list, (Count)

## Data Structure Used

Singly linked list where each node contains a data element say data and the address of the immediate next node say next, with Head holding the address of the first node.

## Pseudo Code

```Begin
Count = 0
while(temp != NULL)
begin
if(temp->data = key)
count=count+1
endif
End while
End
```

## C program to count the number of occurrences of an element in a linked list without using recursion

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

typedef struct list {
int data;
struct list* next;
} node;

int main()
{
node *head = NULL, *temp, *temp1;
int choice, count = 0, key;

do {
temp = (node*)malloc(sizeof(node));
if (temp != NULL) {
printf("\nEnter the element in the list : ");
scanf("%d", &temp->data);
temp->next = NULL;
}
else {
while (temp1->next != NULL) {
temp1 = temp1->next;
}
temp1->next = temp;
}
}
else {
printf("\nMemory not avilable...node allocation is not possible");
}
printf("\nIf you wish to add m ore data on the list enter 1 : ");
scanf("%d", &choice);
} while (choice == 1);

//finding occurence of key
printf("\nEnter the data to find it's occurrence : ");
scanf("%d", &key);

while (temp != NULL) {
if (temp->data == key) {
count = count + 1;
}
temp = temp->next;
}
printf("\n %d occurred %d times in the list", key, count);

return 0;
}
```

## Output

```Enter the element in the list : 1

If you wish to add m ore data on the list enter 1 : 1

Enter the element in the list : 2

If you wish to add m ore data on the list enter 1 : 1

Enter the element in the list : 3

If you wish to add m ore data on the list enter 1 : 1

Enter the element in the list : 4

If you wish to add m ore data on the list enter 1 : 1

Enter the element in the list : 1

If you wish to add m ore data on the list enter 1 : 0

Enter the data to find it's occurrence : 1

1 occurred 2 times in the list
```