# Print the Alternate Nodes in a Linked List using Recursion

Here, we write a recursive function to display the alternative nodes in the linked list, This is a C program that will print the alternative nodes in a linked list using recursion.
Submitted by Piyas Mukherjee, on January 29, 2019

Solution:

Input: A singly linked list whose address of the first node is stored in a pointer, say head

Output: The alternative nodes in the list

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.

Recursive function to print alternative nodes (Pseudocode):

```Function alternate_display(temp):
Begin
IF(temp!=NULL){
Print "temp->data"
If(temp->next==NULL)
temp=NULL;
Else
alternate_display(temp->next->next);
}
Else
return control to the main function
End IF-ELSE
End FUNCTION
```

C Implementation:

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

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

//recursive function
void alternatedisp(node *temp);

int main(){
int choice,count=0,key;

//Taking the linked list as input
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);

//Now displaying the alternative nodes starting from the begining
printf("\nDisplaying the alternative items of the list starting from the begining : \n");
printf("NULL\n");

return 0;
}

//recursive function to display alternative nodes
void alternatedisp(node *temp)
{
if(temp!=NULL)
{
printf("%d->",temp->data);
if(temp->next==NULL)
temp=NULL;
else
alternatedisp(temp->next->next);
}
else
return;
}
```

Output

```Enter the element in the list : 7

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

Enter the element in the list : 6

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

Enter the element in the list : 5

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 : 3

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

Displaying the alternative items of the list starting from the begining :
7->5->3->NULL
```

Preparation

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