linkedlist implementation in c 2b 2b

1#include <iostream>
2
3using namespace std;
4
5struct node
6{
7    int data;
8    node *next;
9};
10
11class linked_list
12{
13private:
14    node *head,*tail;
15public:
16    linked_list()
17    {
18        head = NULL;
19        tail = NULL;
20    }
21
22    void add_node(int n)
23    {
24        node *tmp = new node;
25        tmp->data = n;
26        tmp->next = NULL;
27
28        if(head == NULL)
29        {
30            head = tmp;
31            tail = tmp;
32        }
33        else
34        {
35            tail->next = tmp;
36            tail = tail->next;
37        }
38    }
39};
40
41int main()
42{
43    linked_list a;
44    a.add_node(1);
45    a.add_node(2);
46    return 0;
47}

1
2#include <bits/stdc++.h>
3#include <iostream>
4#include <list>
5#include <iterator>
6
7#define ll long long
8
9using namespace std;
10
11//function to print all the elements of the linked list
12void showList(list <int> l){
13	list <int> :: iterator it; //create an iterator according to the data structure
14	for(it = l.begin(); it != l.end(); it++){
15		cout<<*it<<" ";
16	}
17	
18}	
19
20
21int main(){
22	
23	list <int> l1;
24	list <int> l2;
25	
26	for(int i=0; i<10; i++){
27		l1.push_back(i*2); //fill list 1 with multiples of 2
28		l2.push_back(i*3); //fill list 2 with multiples of 3
29	}
30	
31	cout<<"content of list 1 is "<<endl;
32	showList(l1);
33	cout<<endl;
34	
35	cout<<"content of list 2 is "<<endl;
36	showList(l2);
37	cout<<endl;
38	
39	//reverse the first list
40	l1.reverse();
41	showList(l1);
42	cout<<endl;
43	
44	//sort the first list
45	l1.sort();
46	showList(l1);
47	cout<<endl;
48	
49	//removing an element from both sides
50	l2.pop_front();
51	l2.pop_back();
52	
53	//adding an element from both sides
54	l2.push_back(10);
55	l2.push_front(20);
56	
57	
58    return 0;
59}