Insert A Node At Middle In Linked List using C++

Technology and generation are growing up together, and the younger generation users are somewhat connected with tech and the internet all the time. Not to mention, today the whole world in this time of crisis is working over the internet. But to make these technologies, software, etc a software developer must have excellent problem-solving skills. In this world where the internet is the new fuel, one needs to be pretty sharp. And by sharp, for software developers, it means knowing how to automate real-world problems using computer programs. Data structures help a lot in this journey of logic building. So today we’re going to write a simple data structure program to Insert A Node At the Middle In Linked List using C++.

A linked list is a basic list of nodes containing different elements for all algorithms in data structures. Also, it’s pretty easy to understand.

What’s The Approach?

• Before inserting a new node we’ll first check whether the previous node is null or not. If the previous node is null then we’ll not add the new node.

• If the previous node is not null then we’ll simply create a new node and insert data into it.

• Now we’ll store the address which is stored in the previous node into this new node.

• At last, in the previous node’s address section we will store the address of this new node.

Also Read: Print Smallest Of Three Without Using Comparison Operator in C++

C++ Program To Insert A Node At Middle In Linked List

Input:

`append(6)`

`push(7) `

`insertAfter(8)`

Output:

`Created Linked List is: 7 8 6`

```// C++ program to demonstrate
// insertion method on Linked List in the Middle

#include <bits/stdc++.h>
using namespace std;

class Node
{
public:
int data;
Node *next;
};

/* Given a reference (pointer to pointer)
to the head of a list and an int, inserts
a new node on the front of the list. */
{
/* 1. allocate node */
Node* new_node = new Node();

/* 2. put in the data */
new_node->data = new_data;

/* 3. Make next of new node as head */

/* 4. move the head to point to the new node */
}

/* Given a node prev_node, insert a new node after the given
prev_node */
void insertAfter(Node* prev_node, int new_data)
{
/*1. check if the given prev_node is NULL */
if (prev_node == NULL)
{
cout<<"the given previous node cannot be NULL";
return;
}

/* 2. allocate new node */
Node* new_node = new Node();

/* 3. put in the data */
new_node->data = new_data;

/* 4. Make next of new node as next of prev_node */
new_node->next = prev_node->next;

/* 5. move the next of prev_node as new_node */
prev_node->next = new_node;
}

/* Given a reference (pointer to pointer) to the head
of a list and an int, appends a new node at the end */
{
/* 1. allocate node */
Node* new_node = new Node();

Node *last = *head_ref; /* used in step 5*/

/* 2. put in the data */
new_node->data = new_data;

/* 3. This new node is going to be
the last node, so make next of
it as NULL*/
new_node->next = NULL;

/* 4. If the Linked List is empty,
then make the new node as head */
{
return;
}

/* 5. Else traverse till the last node */
while (last->next != NULL)
last = last->next;

/* 6. Change the next of last node */
last->next = new_node;
return;
}

// This function prints contents of
void printList(Node *node)
{
while (node != NULL)
{
cout<<" "<<node->data;
node = node->next;
}
}

/* Driver code*/
int main()
{

// Insert 6. So linked list becomes 6->NULL

// Insert 7 at the beginning.
// So linked list becomes 7->6->NULL

// Insert 8, after 7. So linked
// list becomes 7->8->6->NULL