stock

最新推荐文章于 2025-06-04 09:12:20 发布

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最新推荐文章于 2025-06-04 09:12:20 发布

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CC 4.0 BY-SA版权

文章标签：算法

本文链接：https://blog.youkuaiyun.com/u012725244/article/details/45849949

本文详细介绍了如何使用C++实现股票的操作（买入、卖出）与价值计算（更新股票价格），包括类的定义、构造函数、成员函数及内部实现细节。

//stock.h

#include <string>

class stock
{
public:
	stock();
	stock(const std::string& co,long n=0,double pr=0.0);
	stock(const stock& s);
	~stock();
	void buy(long num,double price);
	void sell(long num,double price);
	void update(double price);
	void show()const;
	const stock& topval(const stock& s)const;
	stock& operator=(const stock& s);
private:
	static int num;
	std::string company;
	int shares;
	double share_val;
	double total_val;
	void set_tot()
	{
		total_val=shares*share_val;
	}
};

//stock.cpp

#include <iostream>
#include "stock.h"

int stock::num=0;

stock::stock():company("no name"),shares(0),share_val(0.0),total_val(0.0){}
stock::stock(const std::string& co,long n,double pr):company(co),shares(n),share_val(pr){set_tot();}
stock::stock(const stock& s)
{
	company=s.company;
	shares=s.shares;
	share_val=s.share_val;
	total_val=s.total_val;
}
stock::~stock()
{
	std::cout<<std::endl<<++num<<std::endl;
}
void stock::buy(long num,double price)
{
	shares+=num;
	share_val=(total_val+num*price)/shares;
	set_tot();
}
void stock::sell(long num,double price)
{
	shares-=num;
	share_val=(total_val-num*price)/shares;
	set_tot();
}
void stock::update(double price)
{
	share_val=price;
	set_tot();
}
void stock::show()const
{
	using std::cout;
	using std::ios_base;
	using std::endl;
	ios_base::fmtflags orig=cout.setf(ios_base::fixed,ios_base::floatfield);
	std::streamsize prec=cout.precision(3);

	(cout<<"Company: "<<company<<endl
		<<"Shares: "<<shares<<endl
		<<"Share Price: $"<<share_val<<endl).precision(2);
	cout<<"Total Worth: $"<<total_val<<endl;
	cout.setf(orig,ios_base::floatfield);
	cout.precision(prec);
}
const stock& stock::topval(const stock& s)const
{
	return total_val>s.total_val?*this:s;
}

stock& stock::operator=(const stock& s)	//"="必须是成员函数
{
	if(this!=&s)
	{
		company=s.company;
		shares=s.shares;
		share_val=s.share_val;
		total_val=s.total_val;
	}
	return *this;
}

//stock_test.cpp

#include <iostream>
#include "stock.h"

int main()
{
	stock stock1("E",100,10);
	stock1=stock("F",200,20);
	stock stocks[4]=	//对象数组，首先使用默认构造函数创建数组元素，然后花括号中的各构造函数创建临时对象，使用赋值运算符赋值.
	{
		stock("A",12,20.0),
		stock("B",200,2.0),
		stock("C",130,3.25),
		stock("D",60,6.5)
	};
	stock top;
	for(int i=0;i<4;++i)
	{
		stocks[i].show();
		top=top.topval(stocks[i]);
	}
	top.show();
	while(std::cin.get()!='\n');
	return 0;
}