bài 2 thi C++ An

#include <bits/stdc++.h>
using namespace std;

class Store{
    protected:
        int storeNumber;
        int storeProd;
    public:
        Store(int num=0, int pro=0){
            storeNumber = num;
            storeProd = pro;
            if (num<0) storeNumber = 0;
            if (pro<0) storeProd = 0;
        }
        int receipt(int pro){
            storeProd += pro;
        }
        int issue(int pro){
            if (pro>storeProd) cout<<"Error\n";
            else storeProd -= pro;
        }
        int getProd(){
            return storeProd;
        }
        Store &operator += (int val){
            if (val>0) receipt(val);
            if (val<0) issue(val);
            return *this;
        }
};

class reservedStore:public Store{
    public:
        static double lost;
        reservedStore(int num=0, int pro=0):Store(num, pro){
        }
        int calculateLoss(){
            return storeProd - storeProd*lost;
        }
        int calculateLoss(int year){
            for (int i=0; i<year; i++){
                storeProd *= (1.0-lost);
                cout<<storeProd<<" ";
            }
        }
};

class DailyStore:public Store{
    public:
        static int promotion;
        DailyStore(int num=0, int prod=0):Store(num, prod){
        }
        int issue(int val){
            if (val<storeProd){
                Store::issue(val);
                storeProd-=promotion;
            }
            else cout<<"Error\n";
        }
};

int DailyStore::promotion=20;
double reservedStore::lost=0.05;

int main (){
    Store s(1001, 500);
    s.issue(10);
    s.receipt(5);
    cout<<s.getProd()<<endl;
    reservedStore rs1(1002,100), rs2(1003, 200);
    cout<<rs1.calculateLoss()<<" "<<rs2.calculateLoss()<<endl;
    rs1.issue(20);
    rs1.receipt(15);
    rs2.issue(15);
    rs2.receipt(20);
    reservedStore::lost = 0.1;
    cout<<rs1.calculateLoss()<<" "<<rs2.calculateLoss()<<endl;
    DailyStore ds1(1004, 1000), ds2(1005, 400);
    ds1.receipt(50);
    ds1.issue(100);
    ds2.issue(200);
    ds2.receipt(100);
    cout<<ds1.getProd()<<" "<<ds2.getProd()<<endl;
    DailyStore::promotion=50;
    ds1.receipt(50);
    ds1.issue(100);
    ds2.issue(200);
    ds2.receipt(100);
    cout<<ds1.getProd()<<" "<<ds2.getProd()<<endl;
    return 0;
}