C Program to Print Alternate Nodes of a Linked List without Recursion

This C program, using iteration, displays the alternate nodes 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 display a linked list in reverse. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to Print the Alternate Nodes in a Linked List without

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

    printf("\nDisplaying the alternate nodes\n");

```
    display(head);
```
```
    delete(&head);
```
```
 
```
```
    return 0;
```
```
}
```
```
 
```
```
void display(struct node *head)
```
```
{
```
```
    int flag = 0;
```
```
 
```
```
    while(head != NULL)
```
```
    {
```
```
        if (!(flag % 2))
```
```
        {
```
```
           printf("%d  ", head->a);
```
```
        }
```
```
        flag++;
```
```
        head = head->next;
```
```
    }
```
```
}
```
```
 
```
```
void generate(struct node **head)
```
```
{
```
```
    int num, i;
```
```
    struct node *temp;
```
```
 
```
```
    printf("Enter length of list: ");
```
```
    scanf("%d", &num);
```
```
    for (i = num; i > 0; i--)
```
```
    {
```

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

```
        temp->a = i;
```
```
        if (*head == NULL)
```
```
        {
```
```
            *head = temp;
```
```
            (*head)->next = NULL;
```
```
        }
```
```
        else
```
```
        {
```
```
            temp->next = *head;
```
```
            *head = temp;
```
```
        }
```
```
    }
```
```
}
```
```
 
```
```
void delete(struct node **head)
```
```
{
```
```
    struct node *temp;
```
```
    while (*head != NULL)
```
```
    {
```
```
        temp = *head;
```
```
        *head = (*head)->next;
```
```
        free(temp);
```
```
    }
```
```
}}
```

$ gcc alter_iter.c -o alter_iter
$ a.out
Enter length of list: 20
 
Displaying the alternate nodes
1  3  5  7  9  11  13  15  17  19

Sanfoundry Global Education & Learning Series – 1000 C Programs.

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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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