C Program to Search an Element in Linked List without using Recursion

This C program, using iteration, searches for an element in a linked list. A linked list is an ordered set of data elements, each containing a link to its successor.

Here is the source code of the C program to search for an element in a linked list. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
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 * C Program to Search for an Element in the Linked List without

```
 * using Recursion
```
```
 */
```
```
 
```
```
#include <stdio.h>
```
```
#include <stdlib.h>
```
```
 
```
```
struct node
```
```
{
```
```
    int a;
```
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    struct node *next;
```
```
};
```
```
 
```
```
void generate(struct node **, int);
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void search(struct node *, int);
```
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void delete(struct node **);
```
```
 
```
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int main()
```
```
{
```
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    struct node *head = NULL;
```
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    int key, num;
```
```
 
```

    printf("Enter the number of nodes: ");

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    scanf("%d", &num);
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    printf("\nDisplaying the list\n");
```
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    generate(&head, num);
```
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    printf("\nEnter key to search: ");
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    scanf("%d", &key);
```
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    search(head, key);
```
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    delete(&head);
```
```
 
```
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    return 0;
```
```
}
```
```
 
```

void generate(struct node **head, int num)

```
{
```
```
    int i;
```
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    struct node *temp;
```
```
 
```
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    for (i = 0; i < num; i++)
```
```
    {
```

        temp = (struct node *)malloc(sizeof(struct node));

```
        temp->a = rand() % num;
```
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        if (*head == NULL)
```
```
        {
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            *head = temp;
```
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            temp->next = NULL;
```
```
        }
```
```
        else
```
```
        {
```
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            temp->next = *head;
```
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            *head = temp;
```
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        }
```
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        printf("%d  ", temp->a);
```
```
    }
```
```
}
```
```
 
```
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void search(struct node *head, int key)
```
```
{
```
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    while (head != NULL)
```
```
    {
```
```
        if (head->a == key)
```
```
        {
```
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            printf("key found\n");
```
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            return;
```
```
        }
```
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        head = head->next;
```
```
    }
```
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    printf("Key not found\n");
```
```
}
```
```
 
```
```
void delete(struct node **head)
```
```
{
```
```
    struct node *temp;
```
```
 
```
```
    while (*head != NULL)
```
```
    {
```
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        temp = *head;
```
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        *head = (*head)->next;
```
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        free(temp);
```
```
    }
```
```
}
```

$ gcc search_iter.c -o search_iter
$ a.out
Enter the number of nodes: 10
 
Displaying the list
3  6  7  5  3  5  6  2  9  1  
Enter key to search: 2
key found

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