How to insert a node at a given position in linked list?

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create a linked list having 3 nodes . Then write a code to insert a node at a given position and display the modified linked list.

What I have tried:

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

struct Node{
int data;
struct Node *next;
};

int count=0;

void addition(){
struct Node *head;
struct Node *newnode;
struct Node *temp;
int pos,i=1;
newnode=(struct Node*)malloc(sizeof(struct Node));
printf("enter position");
scanf("%d",&pos);
if(pos>count){
printf("invalid position");
}
else{
temp=head;
while(i<pos){
temp="temp-">next;
i++;
}
}
printf("enter data");
scanf("%d",&newnode->data);
newnode->next=temp->next;
temp->next=newnode;

}
void display(struct Node *n){
if(n!=NULL){
printf("%d",n->data);
n=n->next;
}
}
int main(){
struct Node *head;
struct Node *second;
struct Node *third;

head=(struct Node*)malloc(sizeof(struct Node));
second=(struct Node*)malloc(sizeof(struct Node));
third=(struct Node*)malloc(sizeof(struct Node));

head->data=1;
head->next=second;

second->data=2;
second->next=third;

third->data=3;
third->next=0;
count=3;
display(head);
addition();
display(head);
return 0;
}

Posted 10-Apr-21 9:38am

Pragya Priya

Updated 10-Apr-21 10:08am

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Tony Hill · Answer 1 · 2021-04-10T10:08:00

This seems OK now I have cleaned up the placement of the definitions

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

struct Node
{
	int data;
	struct Node *next;
};

int count = 0;

struct Node* head;
struct Node* second;
struct Node* third;

void addition();
void display(struct Node* n);

int main()
{
	head = (struct Node*)malloc(sizeof(struct Node));
	second = (struct Node*)malloc(sizeof(struct Node));
	third = (struct Node*)malloc(sizeof(struct Node));

	head->data = 1;
	head->next = second;

	second->data = 2;
	second->next = third;

	third->data = 3;
	third->next = 0;

	count = 3;
	display(head);

	addition();
	display(head);

	return 0;
}

void addition()
{
	struct Node* newnode;
	struct Node* temp = NULL;

	int pos = 0;
	int i = 1;

	newnode = (struct Node*)malloc(sizeof(struct Node));
	printf("enter position");
	scanf_s("%d", &pos);
	if (pos > count)
	{
		printf("invalid position");
	}
	else
	{
		temp = head;

		while (i < pos)
		{
			temp = temp->next;
			i++;
		}
	}
	printf("enter data");
	scanf_s("%d", &newnode->data);
	newnode->next = temp->next;
	temp->next = newnode;
}

void display(struct Node* n)
{
	if (n != NULL)
	{
		printf("%d", n->data);
		n = n->next;
	}
}