c++链表操作

#include <stdio.h>
#include<iostream>
using namespace std;
class mystudent
{
public:

   // 默认构造函数
    mystudent(int age):m_age(age),m_next(nullptr)
    {
        
    }
   // 从链表尾部插入数据
    mystudent* insert_from_tail(mystudent*head)
    {
        if(!head)
        {
            cout<<"头节点为空:"<<endl;
            return nullptr;
        }
        mystudent*tail = head;
        cout<<"请输入节点："<<endl;
        int num = 0;
        while(1)
        {
            //int num = 0;
            cin>>num;
            if(num<0)
            {
                break;
            }
            mystudent*tmp = new mystudent(num);
            head->m_next = tmp;
            head = head->m_next;
            //cout<<"value = "<<tmp->m_age;
        }
        return tail;
    }
    // 从头部插入数据
    mystudent *insert_from_head(mystudent*head)
    {
        if(!head)
        {
            return nullptr;
        }
        int num = 0;
        mystudent*tail=head;
        cout<<"请输入节点："<<endl;
        while(1)
        {
            cin>>num;
            if(num<0)
            {
                break;
            }
            mystudent*tmp = new mystudent(num);
            tmp->m_next = head->m_next;
            head->m_next = tmp;
            
        }
        return tail;
    }
    // 打印链表数据
    void print_node(mystudent*head)
    {
        if(!head)
        {
            return;
        }
        while(head)
        {
            cout<<head->m_age<<"->";
            head = head->m_next;
        }
    }
private:
    int m_age = 0;
    mystudent*m_next;
};
using namespace std;
int main()
{
    mystudent*m = new mystudent(10);
    mystudent*head =m->insert_from_head(m);
    head->print_node(head);
    cout<<endl;
    return 0;
}