C++银行账户 项目完整代码

Posted 2021-09-20 Roam-G

 C++银行账户 项目完整代码，连续敲打5遍，就学会了。

 

 

 

 

 

//date.h
#ifndef __DATE_H__
#define __DATE_H__

class Date {	//日期类
private:
	int year;		//年
	int month;		//月
	int day;		//日
	int totalDays;	//该日期是从公元元年1月1日开始的第几天

public:
	Date(int year, int month, int day);	//用年、月、日构造日期
	int getYear() const { return year; }
	int getMonth() const { return month; }
	int getDay() const { return day; }
	int getMaxDay() const;		//获得当月有多少天
	bool isLeapYear() const {	//判断当年是否为闰年
		return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
	}
	void show() const;			//输出当前日期
	//计算两个日期之间差多少天	
	int distance(const Date& date) const {
		return totalDays - date.totalDays;
	}
};

#endif //__DATE_H__

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

namespace {	//namespace使下面的定义只在当前文件中有效
	//存储平年中某个月1日之前有多少天，为便于getMaxDay函数的实现，该数组多出一项
	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 = years * 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();
}

//accumulator.h
#ifndef __ACCUMULATOR_H__
#define __ACCUMULATOR_H__
#include "date.h"

class Accumulator {	//将某个数值按日累加
private:
	Date lastDate;	//上次变更数值的时期
	double value;	//数值的当前值
	double sum;		//数值按日累加之和
public:
	//构造函数，date为开始累加的日期，value为初始值
	Accumulator(const Date &date, double value)
		: lastDate(date), value(value), sum(0) { }

	//获得到日期date的累加结果
	double getSum(const Date &date) const {
		return sum + value * date.distance(lastDate);
	}

	//在date将数值变更为value
	void change(const Date &date, double value) {
		sum = getSum(date);
		lastDate = date;
		this->value = value;
	}

	//初始化，将日期变为date，数值变为value，累加器清零
	void reset(const Date &date, double value) {
		lastDate = date;
		this->value = value;
		sum = 0;
	}
};

#endif //__ACCUMULATOR_H__

//account.h
#ifndef __ACCOUNT_H__
#define __ACCOUNT_H__
#include "date.h"
#include "accumulator.h"
#include <string>

class Account { //账户类
private:
	std::string id;	//帐号
	double balance;	//余额
	static double total; //所有账户的总金额
protected:
	//供派生类调用的构造函数，id为账户
	Account(const Date &date, const std::string &id);
	//记录一笔帐，date为日期，amount为金额，desc为说明
	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:
	const std::string &getId() const { return id; }
	double getBalance() const { return balance; }
	static double getTotal() { return total; }
	//显示账户信息
	void show() const;
};

class SavingsAccount : public Account { //储蓄账户类
private:
	Accumulator acc;	//辅助计算利息的累加器
	double rate;		//存款的年利率
public:
	//构造函数
	SavingsAccount(const Date &date, const std::string &id, double rate);
	double getRate() const { return rate; }
	//存入现金
	void deposit(const Date &date, double amount, const std::string &desc);
	//取出现金
	void withdraw(const Date &date, double amount, const std::string &desc);
	//结算利息，每年1月1日调用一次该函数
	void settle(const Date &date);
};

class CreditAccount : public Account { //信用账户类
private:
	Accumulator acc;	//辅助计算利息的累加器
	double credit;		//信用额度
	double rate;		//欠款的日利率
	double fee;			//信用卡年费

	double getDebt() const {	//获得欠款额
		double balance = getBalance();
		return (balance < 0 ? balance : 0);
	}
public:
	//构造函数
	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 {	//获得可用信用
		if (getBalance() < 0) 
			return credit + getBalance();
		else
			return credit;
	}
	//存入现金
	void deposit(const Date &date, double amount, const std::string &desc);
	//取出现金
	void withdraw(const Date &date, double amount, const std::string &desc);
	//结算利息和年费，每月1日调用一次该函数
	void settle(const Date &date);

	void show() const;
};

#endif //__ACCOUNT_H__

 

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

double Account::total = 0;

//Account类的实现
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	//计算年息
		/ date.distance(Date(date.getYear() - 1, 1, 1));
	if (interest != 0)
		record(date, interest, "interest");
	acc.reset(date, getBalance());
}

//CreditAccount类相关成员函数的实现
CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee)
	: Account(date, id), credit(credit), rate(rate), fee(fee), 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, getDebt());
}

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

//7_10.cpp
#include "account.h"
#include <iostream>
using namespace std;

int main() {
	Date date(2008, 11, 1);	//起始日期
	//建立几个账户
	SavingsAccount sa1(date, "S3755217", 0.015);
	SavingsAccount sa2(date, "02342342", 0.015);
	CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
	//11月份的几笔账目
	sa1.deposit(Date(2008, 11, 5), 5000, "salary");
	ca.withdraw(Date(2008, 11, 15), 2000, "buy a cell");
	sa2.deposit(Date(2008, 11, 25), 10000, "sell stock 0323");
	//结算信用卡
	ca.settle(Date(2008, 12, 1));
	//12月份的几笔账目
	ca.deposit(Date(2008, 12, 1), 2016, "repay the credit");
	sa1.deposit(Date(2008, 12, 5), 5500, "salary");
	//结算所有账户
	sa1.settle(Date(2009, 1, 1));
	sa2.settle(Date(2009, 1, 1));
	ca.settle(Date(2009, 1, 1));
	//输出各个账户信息
	cout << endl;
	sa1.show(); cout << endl;
	sa2.show(); cout << endl;
	ca.show(); cout << endl;
	cout << "Total: " << Account::getTotal() << endl;
	return 0;
}