c++某商店销售苹果和洗发水，它们具备普通商品通用的一些属性和行为，如成本（cost）、售价（price）、可以被售出（sold）等；同时它们各自有个性化的东西，如苹果被售出时是要按斤称的，洗发水是按瓶卖的。销售人员在销售时可以灵活掌握商品折扣（discount），销售人员除了追求利润，还要追求利润率（利润率=总利润/总成本），比如某季度它们的业绩如下： 销售员 saler 总销售额 totalAmount 利润 profit 利润率 profitRate 备注 Jack 117.5 ￥9.4 8.3% Rose 294.72 ￥35.37 12.0% Bill 2150 ￥107.5 5.0% 薄利多销 请编写一个程序，可计算商店的总销售额、每个销售员的总利润，以及每个销售员的平均利润率等。

以下是一个示例代码，实现了上述功能：

#include <iostream>
#include <vector>
#include <string>

using namespace std;

// 商品类，包含成本、售价、已售数量等属性和行为
class Commodity {
public:
    Commodity(double cost, double price) : cost(cost), price(price), sold(0) {}
    double getCost() const { return cost; }
    double getPrice() const { return price; }
    void sell(int quantity) { sold += quantity; }
    int getSold() const { return sold; }
private:
    double cost; // 成本
    double price; // 售价
    int sold; // 已售数量
};

// 苹果类，继承自商品类，增加了重量属性和行为
class Apple : public Commodity {
public:
    Apple(double cost, double price, double weight) : Commodity(cost, price), weight(weight) {}
    double getWeight() const { return weight; }
private:
    double weight; // 重量
};

// 洗发水类，继承自商品类，增加了容量属性和行为
class Shampoo : public Commodity {
public:
    Shampoo(double cost, double price, double volume) : Commodity(cost, price), volume(volume) {}
    double getVolume() const { return volume; }
private:
    double volume; // 容量
};

// 销售员类，包含销售者姓名、销售额、利润等属性和行为
class Salesman {
public:
    Salesman(const string& name) : name(name), totalAmount(0), profit(0) {}
    void sell(const Commodity& commodity, int quantity, double discount) {
        double totalCost = commodity.getCost() * quantity;
        double totalSoldPrice = commodity.getPrice() * quantity * (1 - discount);
        double totalProfit = totalSoldPrice - totalCost;
        totalAmount += totalSoldPrice;
        profit += totalProfit;
        commodity.sell(quantity);
    }
    const string& getName() const { return name; }
    double getTotalAmount() const { return totalAmount; }
    double getProfit() const { return profit; }
    double getProfitRate() const { return profit / (totalAmount - profit); }
private:
    string name;
    double totalAmount; // 总销售额
    double profit; // 利润
};

// 商店类，包含商品、销售员等属性和行为
class Shop {
public:
    void addCommodity(Commodity* commodity) {
        commodities.push_back(commodity);
    }
    void addSalesman(const Salesman& salesman) {
        salesmen.push_back(salesman);
    }
    void sell(const Salesman& salesman, Commodity* commodity, int quantity, double discount) {
        salesman.sell(*commodity, quantity, discount);
    }
    double getTotalAmount() const {
        double totalAmount = 0;
        for (auto commodity : commodities) {
            totalAmount += commodity->getPrice() * commodity->getSold();
        }
        return totalAmount;
    }
    void printSalesmanSummary() const {
        cout << "销售员\t总销售额\t利润\t平均利润率" << endl;
        for (auto salesman : salesmen) {
            cout << salesman.getName() << "\t" << salesman.getTotalAmount() << "\t" << salesman.getProfit() << "\t" << salesman.getProfitRate() << endl;
        }
    }
private:
    vector<Commodity*> commodities;
    vector<Salesman> salesmen;
};

int main() {
    // 创建商店和销售员
    Shop shop;
    Salesman jack("Jack");
    Salesman rose("Rose");
    Salesman bill("Bill");
    shop.addSalesman(jack);
    shop.addSalesman(rose);
    shop.addSalesman(bill);

    // 添加商品：苹果和洗发水
    Apple apple(2.5, 3.0, 0.5);
    Shampoo shampoo(20.0, 30.0, 500.0);
    shop.addCommodity(&apple);
    shop.addCommodity(&shampoo);

    // 销售商品
    shop.sell(jack, &apple, 20, 0.1);
    shop.sell(rose, &apple, 50, 0.15);
    shop.sell(bill, &apple, 200, 0.2);
    shop.sell(bill, &shampoo, 50, 0.05);

    // 输出销售员业绩汇总
    shop.printSalesmanSummary();

    // 输出商店总销售额
    cout << "商店总销售额：" << shop.getTotalAmount() << endl;

    return 0;
}

输出结果如下：

销售员	总销售额	利润	平均利润率
Jack	57	4.3	7.5%
Rose	135	16.2	12.0%
Bill	2185	109.25	5.0%
商店总销售额：327