C++ 第七章 个人银行账户管理程序案例

Posted 2020-10-10 Barry

【第七章】 个人银行账户管理程序  案例实现

 

//account.cpp 
#include"account.h"
#include<cmath>
#include<iostream>
using namespace std;

double Account::total = 0;
//Account类相关成员函数的实现
Account::Account(const Date &date, const string &id) : id(id), balance(0) {
	date.show();
	cout << "\t#" << id << "  created" << endl;

}
void Account::record(const Date &date, double amount, const string &desc)

{


	amount = floor(amount * 100 + 0.5) / 100; //保留小数点后两位

	balance += amount;

	total += amount;
	date.show();

	cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;

}
void Account::show() const
{
	cout << id << "\tBalance:" << balance;
}

void Account::error(const string &msg)const

{

	cout << "Error(#" << id << "):" << msg << endl;

}







//SavingsAccount类相关成员函数的实现

SavingsAccount::SavingsAccount(const Date &date, const string &id, double rate) : Account(date,id), rate(rate), acc(date,0)
{

}



void SavingsAccount::deposit(const Date &date, double amount, const string &desc)

{

	record(date, amount, desc);
	acc.change(date, getBalance());
}

void SavingsAccount::withdraw(const Date &date, double amount, const string &desc)

{

	if (amount > getBalance()) {
	error("not enough money");
}
	else {

		record(date, -amount, desc);
		acc.change(date, getBalance());
	}
}

void SavingsAccount::settle(const Date &date)

{

	double interest = acc.getSum(date)*rate / date.distance(Date(date.getYear() - 1, 1, 1)); //计算年息

	if (interest != 0)

		record(date, interest, "interest");

	acc.reset(date,getBalance());

}
CreditAccount::CreditAccount(const Date &date, const std::string &id, double credit, double rate, double fee)
	: Account(date, id), credit(credit), fee(fee), rate(rate), acc(date, 0) {}
void CreditAccount::deposit(const Date &date, double amount, const string &desc)

{

	record(date, amount, desc);
	acc.change(date, getDebt());
}

void CreditAccount::withdraw(const Date &date, double amount, const string &desc)

{

	if (amount-getBalance() > credit) {
		error("not enough credit");
	}
	else {

		record(date, -amount, desc);
		acc.change(date, getDebt());
	}
}
void CreditAccount::settle(const Date &date)

{

	double interest = acc.getSum(date)*rate;

	if (interest != 0)

		record(date, interest, "interest");
	if (date.getMonth() == 1)
		record(date, -fee, "annual fee");
	acc.reset(date, getBalance());

}
void CreditAccount::show() const
{
	Account::show();
	cout << "\tAvailable credit: " << getAvailableCredit();
}

　　

// account.h : Defines the entry point for the console application.

#ifndef _ACCOUNT_H_

#define _ACCOUNT_H_

#include"date.h"
#include"accumulator.h"
#include<string>


class Account //储蓄账户类

{

private:

	std::string id; //账号

	double balance; //余额

	static double total; //所有账户的总金额
protected:
	Account(const Date&date, const std::string &id);
	//记录一笔账，date为日期，desc为说明,amount为金额

	void record(const Date &date, double amount, const std::string &desc);

	//报告错误信息
	void error(const std::string &msg)const;


public:

	//构造函数


	const std::string &getId() const { return id; }

	double getBalance() const { return balance; }

	static double getTotal() { return total; }

	void show() const;//显示账户信息
};
class SavingsAccount:public Account{
private:
	Accumulator acc;
	double rate;
public:
	SavingsAccount(const Date &date, const std::string &id, double rate);
	double getRate() const { return rate; }

	void deposit(const Date &date, double amount, const std::string &desc); //存入现金

	void withdraw(const Date &date, double amount, const std::string &desc); //取出现金
																	 
	void settle(const Date &date);//结算利息，每年1月1日调用一次该函数

};
class CreditAccount :public Account {
private:
	Accumulator acc;
	double credit;
	double rate;
	double fee;
	double getDebt()const {
		double balance = getBalance();
		return(balance < 0 ? balance : 0);
	}
public:
	CreditAccount(const Date &date, const std::string &id, double credit, double rate, double fee);
	double getCredit() const { return credit; }
	double getRate() const { return rate; }
	double getFee() const { return fee; }
	double getAvailableCredit() const {
		if (getBalance() < 0)
			return credit + getBalance();
		else
			return credit;
	}
	void deposit(const Date &date, double amount, const std::string &desc); //存入现金

	void withdraw(const Date &date, double amount, const std::string &desc); //取出现金

	void settle(const Date &date);//结算利息，每年1月1日调用一次该函数

	void show() const;//显示账户信息

};

#endif//_ACCOUNT_H_

　　

//accumulator.h 
#ifndef _ACCUMULATOR_H_
#define  _ACCUMULATOR_H_
#include"date.h"
class Accumulator {
private:
	Date lastDate;
	double value;
	double sum;
public:
	Accumulator(const Date&date,double value):lastDate(date),value(value),sum(0){}
	double getSum(const Date &date)const {
		return sum + value*date.distance(lastDate);
	}
	void change(const Date&date, double value) {
		sum = getSum(date);
		lastDate = date;
		this->value = value;
	}
	void reset(const Date&date, double value) {
		lastDate = date;
		this->value = value;
		sum = 0;
	}
};
#endif // _ACCUMULATOR_H_

　　

// chapter07银行账户.cpp : Defines the entry point for the console application.
//


// chapter06.cpp : Defines the entry point for the console application.
//7_10.cpp


//#include"account.h"
#include"account.h"
#include"date.h"
#include<iostream>
using namespace std;

int main() {
	Date date(2008, 11, 1);

	//建立几个账户
	

	SavingsAccount sa1(date, "03755217", 0.015);
    
	SavingsAccount sa2(date, "02342342", 0.015);
	
	CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);

    //11月的几笔账目

	sa1.deposit(Date(2008, 11, 5), 5000, "salary");
	ca.withdraw(Date(2008, 11, 15), 2000, "buy a phone");
	sa2.deposit(Date(2008, 11, 25), 10000, "sell stock 0323");
	//结算信用卡
	ca.settle(Date(2008, 12, 1));
	//12月的几笔账目
	ca.deposit(Date(2008, 12, 1), 2016, "repay the credit");
	sa1.deposit(Date(2008, 12, 1), 5500, "salary");

	//结算所有的账户并输出各个账户信息
	sa1.settle(Date(2009, 1, 1));
	sa2.settle(Date(2009, 1, 1));
	ca.settle(Date(2009, 1, 1));

	cout << endl;
	sa1.show();cout << endl;
	sa2.show();cout << endl;
	ca.show();cout << endl;
	
	cout << "Total: " << Account::getTotal() << endl;
	return 0;
}

　　

//date.cpp

#include"date.h"
#include<iostream>
#include<cstdlib>
using namespace std;
namespace {
	const int DAYS_BEFORE_MONTH[] = { 0,31,59,90,120,151,181,212,243,273,304,334,365 };
}
Date::Date(int year, int month, int day) :year(year), month(month), day(day) {
	if (day <= 0 || day > getMaxDay()) {
		cout << "Invalid date: ";
		show();
		cout << endl;
		exit(1);
	}
	int years = year - 1;
	totalDays = year * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day;
	if (isLeapYear() && month > 2) totalDays++;
}
int Date::getMaxDay()const {
	if (isLeapYear() && month == 2)
		return 29;
	else
		return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
}
void Date::show() const {
	cout << getYear() << "-" << getMonth() << "-" << getDay();
}

　　

//date.h

#ifndef _DATE_H_
#define _DATE_H_
class Date {
private:
	int year;
	int month;
	int day;
	int totalDays;
public:
	Date(int year, int month, int day);
	int getYear()const { return year; }
	int getMonth() const { return month; }
	int getDay()const { return day; }
	int getMaxDay()const;
	bool isLeapYear()const {
		return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
	}
	void show()const;
	int distance(const Date &date)const {
		return totalDays - date.totalDays;
	}
};
#endif // !_DATE_H_

ps：

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