这个程序是一个银行账户管理的程序，是用C++来实现程序功能的，该程序包含六个文件，其中有date.h头文件

是日期类的头文件，date.cpp是日期类的实现文件，accumulator.h是按日将数值累加的accumulator类的头文件，

account.h是各个储蓄账户类定义的头文件，account.cpp是各个储蓄账户类的实现文件，还有就是主函数文件。该

程序包含了增加账户功能、存款功能、取款功能、查询账户信息功能、改变日期功能、进入下个月的处理功能，最

后是退出程序。下面是各个程序文件：

1.date.h日期类的头文件

#ifndef _DATE_H
#define _DATE_H
#include <iostream>
using namespace std;
class Date
{
public:Date(int year = 1,int month = 1,int day = 1);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int operator-(const Date &date)const      //计算两个日期之间差多少天
    {return totalDays - date.totalDays;}bool operator<(const Date &date)const     //判断两个日期的前后顺序
    {return totalDays < date.totalDays;}
private:int year;int month;int day;int totalDays;       //该日期是从公元元年1月1日开始的第几天
};
istream& operator >> (istream &in, Date &date);
ostream& operator << (ostream &out, const Date &date);#endif

2.date.cpp日期类实现的文件

#include <iostream>
#include <stdexcept>
#include "date.h"
using namespace std;namespace      //namespace使下面的定义只在当前文件中有效
{//存储平年中的某个月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())throw runtime_error("Invalid date");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;elsereturn DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
}
void Date::show()const
{cout << getYear() << "-" << getMonth() << "-" << getDay();
}
istream& operator >> (istream &in, Date &date)
{int year, month, day;char c1, c2;in >> year >> c1 >> month >> c2 >> day;if (c1 != '-' || c2 != '-')throw runtime_error("Bad time format");date = Date(year, month, day);return in;
}
ostream& operator<<(ostream &out, const Date &date)
{out << date.getYear() << "-" << date.getMonth() << "-" << date.getDay();return out;
}

3.accumulator.h按日将数值累加的头文件

#ifndef _ACCUMULATOR_H
#define _ACCUMULATOR_H
#include "date.h"
class Accumulator            //将某个数值按日累加
{
public://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){}double getSum(const Date &date)const{return sum + value*(date - lastDate);}//在date将数值变更为valuevoid 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;}
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
};#endif

4.account.h各个储蓄账户类定义的头文件

#ifndef _ACCOUNT_H
#define _ACCOUNT_H
#include "date.h"
#include "accumulator.h"
#include <iostream>
#include <string>
#include <map>
#include <istream>
#include <stdexcept>
using namespace std;class Account;
class AccountRecord        //账目记录
{
public:AccountRecord(const Date &date, const Account* account, double amount, double balance, const string &desc);void show()const;          //输出当前记录
private:Date date;                 //日期const Account* account;    //账户double amount;             //金额double balance;            //余额string desc;               //描述
};typedef multimap<Date, AccountRecord> RecordMap;
//账户类
class Account
{
public:const string& getId()const{return id;}double getBalance()const{return balance;}static double getTotal(){return total;}//存入现金，date为日期，amount为金额，desc为款项说明virtual void deposit(const Date &date, double amount, const string &desc) = 0;//取出现金，date为日期，amount为金额，desc为款项说明virtual void withdraw(const Date &date, double amount, const string &desc) = 0;//结算，每月结算一次，date为结算日期virtual void settle(const Date &date) = 0;//显示账户信息virtual void show(ostream &out)const;//查询指定时间内的账目记录static void query(const Date &begin, const Date &end);
protected://供派生类调用的构造函数Account(const Date &date, const string &id);//记录一笔账，date为日期，amount为金额，desc为说明void record(const Date &date, double amount, const string &desc);//报告错误信息void error(const string &msg)const;
private:string id;              //账户double balance;         //余额static double total;    //所有账户的总金额static RecordMap recordMap;    //账目记录
};
inline ostream& operator<<(ostream &out, const Account &account)
{account.show(out);return out;
}class SavingAccount :public Account         //储蓄账户类
{
public:SavingAccount(const Date &date, const string &id, double rate);double getRate()const{return rate;}//存入现金void deposit(const Date &date, double amount, const string &desc);//取出现金void withdraw(const Date &date, double amount, const string &desc);//结算利息，每年1月1日调用一次该函数void settle(const Date &date);
private:Accumulator acc;           //辅助计算利息的累加器double rate;               //存款的年利率
};class CreditAccount :public Account        //信用账户类
{
public:CreditAccount(const Date &date, const 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            //获得可用信用额度
    {if (getBalance() < 0)return credit + getBalance();elsereturn credit;}//存入现金void deposit(const Date &date, double amount, const string &desc);//取出现金void withdraw(const Date &date, double amount, const 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);virtual void show(ostream &out)const;
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);}
};class AccountException :public runtime_error
{
public:AccountException(const Account* account, const string &msg) :runtime_error(msg), account(account){}const Account* getAccount()const{return account;}
private:const Account* account;
};#endif

5.account.cpp各个储蓄账户类的实现文件

#include <iostream>
#include <cmath>
#include <utility>
#include "account.h"
using namespace std;
using namespace std::rel_ops;//AccountRecord类的实现
AccountRecord::AccountRecord(const Date &date,const Account* account,double amount,double balance,const string &desc):\
date(date), account(account), amount(amount), balance(balance), desc(desc)
{
}
void AccountRecord::show()const
{cout << date << "\t#" << account->getId() << "\t" << amount << "\t" << balance << "\t" << desc << endl;
}//Account类的实现
double Account::total = 0;
RecordMap Account::recordMap;
Account::Account(const Date &date, const string &id):id(id),balance(0)
{cout << date << "\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(ostream &out)const
{out << id << "\tBalance: " << balance;
}
void Account::error(const string &msg)const
{throw AccountException(this, msg);
}
void Account::query(const Date &begin, const Date &end)
{if (begin <= end){RecordMap::iterator iter1 = recordMap.lower_bound(begin);RecordMap::iterator iter2 = recordMap.upper_bound(end);for (RecordMap::iterator iter = iter1;iter != iter2;++iter)iter->second.show();}
}//CreditAccount类的实现
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(ostream &out)const
{Account::show(out);out << "\tAvailable credit: " << getAvailableCredit();
}//SavingAccount类的实现
SavingAccount::SavingAccount(const Date &date, const string &id, double rate) :Account(date, id), rate(rate), acc(date, 0)
{
}
void SavingAccount::deposit(const Date &date, double amount, const string &desc)
{record(date, amount, desc);acc.change(date, getBalance());
}
void SavingAccount::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 SavingAccount::settle(const Date &date)
{if (date.getMonth() == 1)        //每年的1月计算一次利息
    {double interest = acc.getSum(date)*rate / (date - Date(date.getYear() - 1, 1, 1));if (interest != 0)record(date, interest, "interest");acc.reset(date, getBalance());}
}

6.主函数文件

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <vector>
#include <algorithm>
#include "account.h"
using namespace std;struct deleter
{template<class T>void operator()(T *p){delete p;}
};
//控制器类，用来存储账户列表和处理命令
class Controller
{
public:Controller(const Date &date) :date(date), end(false){}~Controller();const Date& getDate()const{return date;}bool isEnd()const{return end;}//执行一条命令，返回该命令是否改变了当前状态(即是否需要保存当前命令)bool runCommand(const string &cmdLine);
private:Date date;vector<Account*> accounts;       //账户列表bool end;                        //用户是否输入了退出命令
};
Controller::~Controller()
{for_each(accounts.begin(), accounts.end(), deleter());
}
bool Controller::runCommand(const string &cmdLine)
{istringstream str(cmdLine);char cmd, type;int index, day;double amount, credit, rate, fee;string id, desc;Account* account;Date date1, date2;str >> cmd;switch (cmd){case 'a':               //增加账户str >> type >> id;if (type == 's'){str >> rate;account = new SavingAccount(date, id, rate);}else{str >> credit >> rate >> fee;account = new CreditAccount(date, id, credit, rate, fee);}accounts.push_back(account);return true;case 'd':              //存入现金str >> index >> amount;getline(str, desc);accounts[index]->deposit(date, amount, desc);return true;case 'w':              //取出现金str >> index >> amount;getline(str, desc);accounts[index]->withdraw(date, amount, desc);return true;case 's':              //查询各账户信息for (size_t i = 0;i < accounts.size();++i){cout << "[" << i << "]";accounts[i]->show(cout);cout << endl;}return false;case 'c':             //改变日期str >> day;if (day < date.getDay())cout << "You cannot specify a previous day";else if (day > date.getMaxDay())cout << "Invalid day";elsedate = Date(date.getYear(), date.getMonth(), day);return true;case 'n':               //进入下个月if (date.getMonth() == 12)date = Date(date.getYear() + 1, 1, 1);elsedate = Date(date.getYear(), date.getMonth() + 1, 1);for (vector<Account*>::iterator iter = accounts.begin();iter != accounts.end();++iter)(*iter)->settle(date);return true;case 'q':             //查询一段时间内的账目str >> date1 >> date2;Account::query(date1, date2);return false;case 'e':             //退出end = true;return false;}cout << "Invalid command: " << cmdLine << endl;return false;
}
int main()
{Date date(2018, 1, 1);         //起始日期
    Controller controller(date);string cmdLine;const char *FILE_NAME = "commands.txt";ifstream fileIn(FILE_NAME);      //以读模式打开文件if (fileIn)                //如果正常打开，就执行文件中的每一条命令
    {while (getline(fileIn, cmdLine))controller.runCommand(cmdLine);fileIn.close();}ofstream fileOut(FILE_NAME, ios_base::app);        //以追加模式打开文件cout << "(a)add account  (d)deposit  (w)withdraw  (s)show  (c)change day  (n)next month  (q)query  (e)exit" << endl;while (!controller.isEnd())        //从标准输入读入命令并执行，直到退出
    {cout << controller.getDate() << "\tTotal: " << Account::getTotal() << "\tcommand";string cmdLine;getline(cin, cmdLine);if (controller.runCommand(cmdLine))fileOut << cmdLine << endl;          //将命令写入文件
    }return 0;
}

最后运行主函数将程序功能实现，可以进行增加账户功能、存款功能、取款功能、查询账户信息功能、改变日期功

能、进入下个月的处理功能将程序进行操作，最后附上一张我操作这些功能的截图。

转载于:https://www.cnblogs.com/XNQC1314/p/9011891.html

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