Doubly linked list is rotated

Doubly linked list is rotated by p number of nodes which is taken input from the user

Author: yashasvi25

doubly link/rotate_doublylinkedlist.cpp

@@ -0,0 +1,68 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+struct node
+{
+  int data;
+  struct node*next,*prev;
+};
+
+struct node* update(struct node*start,int p);
+
+int main()
+{
+
+        int n,p; // n is the number of nodes in the linked list , p is the number of nodes to be rotated starting from the head of linked list 
+        cin>>n>>p;
+        struct node*start=NULL,*cur=NULL,*ptr=NULL;
+        for(int i=0;i<n;i++)
+        {
+            int a;
+            cin>>a;
+            ptr=new(struct node);
+            ptr->data=a;
+            ptr->next=NULL;
+            ptr->prev=NULL;
+            if(start==NULL)
+            {
+                start=ptr;
+                cur=ptr;
+            }
+            else
+            {
+                cur->next=ptr;
+                ptr->prev=cur;
+                cur=ptr;
+            }
+        }
+        struct node*str=update(start,p);
+        while(str!=NULL)
+        {
+            cout<<str->data<<" ";
+            str=str->next;
+        }
+        cout<<endl ;
+}
+
+struct node*update(struct node*start,int p)
+{
+    node* temp = start ;
+    
+    while(temp->next!=NULL)
+    {
+        temp = temp->next ;
+    }
+    node* s= start ;
+    for(int i=0;i<p;i++)
+    {
+        node* t = s ;
+       s = s->next ;
+       temp->next = t ;
+       t->prev = temp ; 
+       temp=temp->next ;
+       t->next = NULL ;
+    }
+    return s ;
+}
+
+