c++ 链表和类配合使用

Goods类，用于存放每件货物重量，total_weight用来存储全部重量 ，通过三个函数实现，对链表的增删遍历

#include <iostream>

using namespace std;

class Goods
{
public:
    Goods()
    {
        m_weight = 0;
        m_next = NULL;
    }
    Goods(int weight)
    {
        this->m_weight = weight;
        m_next = NULL;
        total_weight += weight;
        cout<<"当前添加重量为："<<this->m_weight<<"总重量为："<<total_weight<<endl;
    }
    int get_mweight()
    {
        return this->m_weight;
    }
    ~Goods()
    {
        cout<<"已删除"<<endl;
        total_weight -= this->m_weight;
    }
    Goods* m_next;
private:
    int m_weight;
    static int total_weight;
};
int  Goods::total_weight = 0;

void buy(Goods*& head,int weight)
{
    Goods* temp = new Goods(weight);
    if(head == NULL)
    {
        head = temp;
    }
    else
    {
        temp->m_next = head;
        head = temp;
    }
}
void sale(Goods*& head)
{
    if(head == NULL)
    {
        cout<<"没有可以删除的节点"<<endl;
    }
    else
    {
        Goods* temp = head->m_next;
        delete head;
        head = temp;
    }
}

void Goods_display(Goods* head)
{
    if(head == NULL)
        cout<<"没有货物"<<endl;
    
    while(head != NULL)
    {
        cout<<head->get_mweight()<<endl;
        head = head->m_next;
    }
}

int main(void)
{
    int choise = 0;
    Goods* head = NULL;
    int weight = 0;
    while(1)
    {
        cout<<"1、进货"<<endl;
        cout<<"2、出货"<<endl;
        cout<<"3、遍历"<<endl;
        cout<<"0、退出"<<endl;
        cin>>choise;
        switch (choise)
        {
        case 1:
            cout<<"请输入货物重量："<<endl;
            cin>>weight;
            buy(head,weight);
            break;
        case 2:
            sale(head);
            break;
        case 3:
            Goods_display(head);
            break;
        case 0:
            exit(0);
            break;
        default:
            break;
        }
    }
    return 0;
}
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