LinkList

// linklist.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
using namespace std;

//Make a class named node whose instances will be used in LinkList //class
class node
{
      friend class linklist;
private:
      int val;
      node *next;
public:
            //Sets value of variable val to the argument passed.
      void setvalue(int x)
      {
            val=x;

      }
            //Returns value of variable val
      int getvalue()
      {
            return val;
      }
            //Sets the node type object to the argument passed
      void setnext(node *a)
      {
            next=a;
      }
//Returns the address of next because "next" is a node type //pointer.
      node * getnext()
      {
            return next;

      }
     

};
class linklist
{
private:
      int size;         //Total nodes in linklist
      node* head;       //head has address of first node of linklist.
     
      node *current;
public:
      linklist()
      {
      current=NULL;
      size=0;
     
      }
//This function returns the address of node in linklist whose //location is passed to the function.
      node *getnode(int loc)
      {
            node *x;
            if(loc<=0 || loc>size)
                  x=NULL;
            else 
            {
            //Assign x address of first node
                  x=head;          
            //Start from first location to the location passed
                  for(int i=1;i<loc;i++)
                  x=x->getnext();         //Assign x address of next node.
            }
            return x;         //When loop completes return the value of x.
            }

//Insertnode function accepts two arguments first is value of //node second is location of node where to insert the node.
      void insertnode(int val,int loc)
      {
            if(loc<=0 || loc>size+1 )//Invalid Location
           
                  cout<<"invalid index"<<endl;
            else
            {
                  node *temp=new node();//Create a new object of type node.
                  temp->setvalue(val);  //Set the value of node.
                 
                 
                        if(size==0) //If linklist is empty.
                        {
            //Assign next to NULL it is first node.
                              temp->setnext(NULL);
            //Assign head address of first node.
                              head=temp; 
                        }
            //If node is being inserted on first location

                        else if(loc==1)                    
                        {
                        //Assign x address of node already on that location.
                        node *x=getnode(loc);
                        //Set next of temp to x.
                        temp->setnext(x);
            //Assign head to temp because now it is on first location
                        head=temp;
                        }
           
                 
            //If node is being inserted on last location

                  else if(loc==size)                 
                  {
                        node *x =getnode(size);//Get address of last node
                        x->setnext(temp); //Set next of x to temp.
            //Set next of temp to NULL because now temp is last node.
                        temp->setnext(NULL);
}
                        else //If node is being inserted in middle.
                        {
                              //Get address of previous node.
                              node *x=getnode(loc-1);
                              //Set next of temp to the next of x.
                              temp->setnext(x->getnext());
                              //Now set next of x to temp.
                              x->setnext(temp);
                        }
                        size++;//Increase size to 1.
            }
           
      }

            //Display function displays all elements of linklist.
            void display()
      {
            node *p;
            p=head;//Assign p the address of first node.
            while(p) //Loop continues until nodes exists.
            {
                  //Display value of node.
                  cout<<p->getvalue()<<endl;
                  //Assign p address of next node.
                  p=p->getnext();
            }
      }

//Deletenode function deletes node from linklist on basis of //location passed to it.
            void deletenode(int loc)
      {
                  node *last;
                  node *current1;
                  if(loc==size) //If last node is deleted.
                  {
                  //Get address of second last node in current1.
                  current1=getnode(size-1);
            //Assign next of current1 to NULL because now it is last node.
                  current1->setnext(NULL);
            //Assign current1 address of last node it is node to be deleted
                  current1=getnode(size);
                 
                  }
                  if(loc==1) //If first node is being deleted
                  {
                        //Assign last the address of second node.
                        last=getnode(loc+1);
            //Assign head address of last because now itwill be first node.
                        head=last;
            //Assign current1 address of first node it is node to be deleted
                        current1=getnode(loc);
                  }
                  else  //Node is being deleted from middle.
                  {
//Get address of previous node from the node to be deleted in //current1.
                        current1=getnode(loc-1);
//Get address of node which is after the node to be deleted in //last.
                        last=getnode(loc+1);
            //Set next of current1 to last.
                        current1->setnext(last);
            //Assign current1 address of node to be deleted
                        current1=getnode(loc);
                  }
                  delete current;   //Now delete the node.
                  size--;           //Decrease size to 1.
      }
};


     



int _tmain(int argc, _TCHAR* argv[])
{
            linklist li;      //Create object of linklist.
            //Call insertnode function with value 10 & location 1.
            li.insertnode(10,1);
//Again call function insertnode with value 50 & location 1.Now //when you will call it with location 1 again first node will go //to second place
            li.insertnode(50,1);
            //Again call insertnode.
            li.insertnode(20,2);
            //Again call insertnode.
            li.insertnode(30,3);
            //Again call insertnode.
            li.insertnode(40,4);
            //Now display node values before a node is deleted.
            cout<<"Before deletion list is"<<endl;
            li.display();
            //Call deletenode function with location 2.
            li.deletenode(2);
            //Now display node values after a node is deleted.
            cout<<"After deletion list is"<<endl;
            li.display();

      return 0;
}


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