linklist program that i have a problem

// nomi az akhar.cpp : Defines the entry point for the console application.
//

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

class node 
{
	friend class linklist ;
	int data ;
	node *next ;
};

class linklist
{

public:

	linklist() ;
	void insert() ;
	void search();
	void show();

private:

	node *last;
	node *first ;

};


linklist::linklist()
{
	last = first = NULL ;
}

void linklist ::insert()
{
	int n ;
	cout <<"plz enter the numbers of numbers :" << endl ;
	cin >> n;
	cout << "enter the numbers :" << endl ;
	for(int i =0 ; i < n ; i++)
	{
        node *help = new node ();
        cin >> help -> data ;
        help->next = NULL;
        if(first == NULL)
        {
            first = help ;
            last = help;
        }
        else
        {
            node* temp = first;
            while(temp->next != NULL)
            {
                temp = temp->next;
            }
            temp->next = help;
            last = help;
        }
    }
}

void linklist::search()
{
	//chand ta adad begire n omin adad az akharo prinnt kone
	int n , m ;
	cout <<"plz enter the numbers of numbers :" << endl ;
	cin >> n;
	cout <<"plz enter number of gereh :" << endl ;
	cin >> m;
	node *p = first ;
	//while ( p != NULL )
	//{
		if ( n > m)
		{
			p = p -> next ;
		}
		else
		{
			cout <<"yay"<< p->next-> data ;	
		}
		
//	}
	cout <<"yay"<<p;
}

void linklist ::show()
{
	//int r = 2;
    //cout << "number      " <<endl ;
    node *curPtr = first;
  
      /*while( curPtr ) {
            for(int i =0 ;i<3 ;i++){
                 cout << curPtr -> data << "     ";
            }
		         curPtr = curPtr -> next;
		         r ++;
            }*/
	
    while(curPtr)
    {
        cout<<curPtr->data<<endl;
        curPtr = curPtr->next;
	
	}
}
int main()
{
	
    linklist m;
    m.insert();
    m.show();
	m.search();
	
	return 0;
}