#include "pch.h"
#include <iostream>
using namespace std;
class goods {
public:
goods(int w) {
weight = w;
total_weight += w;
}
~goods() {
total_weight -= weight;
}
static int total_weight_fun() {//类的函数，不能访问普通成员变量和普通函数
return total_weight;
}
goods *next; private:
int weight;
static int total_weight;//类的成员
}; int goods::total_weight = ;//声明与定义静态数据成员 void purchase(goods *&front, goods *&rear, int w) {
goods *p = new goods(w);
p->next = NULL; if (front == NULL) {
front = rear = p;
}
else {
rear->next = p;
rear = rear->next;
}
} void sale(goods *&front, goods *&rear) {
if (front == NULL) {
cout << "no any goods" << endl;
return;
} goods *q = front;
front = front->next;
delete q;
cout << "sale front goods" << endl;
}
int main()
{
goods *front = NULL, *rear = NULL;
int choice;
int weight;
do {
cout << "Key in 1 is purchase,\nKey in 2 is sale,\nKey in 0 is over.\n";
cin >> choice; switch(choice) {
case :
{
cout << "input weiht:";
cin >> weight;
purchase(front, rear, weight);
break;
}
case :
{
sale(front, rear);
break;
}
case :
break; } cout << "now total weight is: "<< goods::total_weight_fun()<<endl;
} while (choice);
cout << "exit!\n";
}