Implementation of singly List insertion, deletion with Class in c++

This article explains the concept of singly link list data structure and provides the simple implementation

in C++.

//// Created by Laxmi Kadariya on 7/15/17.//
#include <iostream>using namespace std;


class node{
private:
    int value;
    node* next;

public:
    node(){

    }

    void set_value(int value_arg){
        value = value_arg;
    }

    void set_next(node* next_arg)
    {
        next = next_arg;
    }

    int show_value(){
        return value;

    }

    node* show_next()
    {
        return next;
    }






};

class linklist{
private:
    node* head;

public:
    linklist(){
        head = NULL;
    }
    void add_node(int value);
    void display_node();
    int length_list();
    void del( int value);


};

void linklist::add_node(int value) {
    node *Node = new node();
    Node->set_value(value);
    Node->set_next(NULL);

    node* tmp = head;

    if(tmp == NULL)
    {
        head = Node;


    }
    else    {
        while(tmp->show_next() != NULL)
        {
            tmp = tmp->show_next();
        }
        tmp->set_next(Node);
    }

  cout<<"node"<<value<< "added"<<endl;

}
int linklist::length_list() {
    int len = 0;
    node* tmp = head;


    while(tmp->show_next() != NULL){
        tmp = tmp->show_next();
        len = len+1;

    }

    return len+1;

}

void linklist::del(int value) {

    node* tmp = head;
    node* prev;

  while(tmp->show_next() != NULL)
  {
      if(tmp->show_value() == value)
      {
          if(head->show_value() == tmp->show_value())
          {
              head = head->show_next();
          }

          else{

              prev->set_next(tmp->show_next());

          }


          delete tmp;
          break;
      }
      else{
          prev=tmp;

          tmp = tmp->show_next();
      }
  }
    if(tmp->show_next() == NULL and tmp->show_value() == value)
    {
        if(head->show_next() == NULL and head->show_value() == value)
        {
            head = NULL;
            delete tmp;
        }

        else        {

            prev->set_next(tmp->show_next());
            delete tmp;
        }
    }


}

void linklist::display_node() {

    node* tmp = head;

    while(tmp->show_next() != NULL)
    {
        std::cout << tmp->show_value()<<endl;
        tmp = tmp->show_next();
    }

    std::cout << tmp->show_value()<<endl;




}
int main(){
    linklist list;
    list.add_node(10);
    list.add_node(20);
    list.add_node(30);
    list.add_node(40);
    list.add_node(50);
    list.display_node();
    int size = list.length_list();
    cout<<size<<endl;
    list.del(30);
    list.display_node();
     size = list.length_list();
    cout<<size<<endl;

}