【C++ 第六章 个人银行账户管理程序案例】

【第六章】 个人银行账户管理程序  案例实现

//第六章完整代码 
#include<iostream>
#include<cstdlib>
#include<cmath>
using namespace std;    
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;
    }
};
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();
}
class SavingsAccount //储蓄账户类

{

private:

    std::string id; //账号

    double balance; //余额

    double rate; //存款的年利率

    Date  lastDate; //上次变更余额的日期

    double accumulation; //余额按日累加之和

    static double total; //所有账户的总金额

                         //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;
    //获得到指定日期为止的存款金额按日累积值
    double accumulate(const Date &date) const

    {

        return accumulation + balance*date.distance(lastDate);

    }

public:

    //构造函数

    SavingsAccount(const Date &date, const std::string &id, double rate);

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

    double getBalance() const { return balance; }

    double getRate() const { return rate; }

    static double getTotal() { return total; }

    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

                                            //结算利息，每年1月1日调用一次该函数

    void settle(const Date &date);

    //显示账户信息



    void show() const;

};
double SavingsAccount::total = 0;

//SavingsAccount类相关成员函数的实现

SavingsAccount::SavingsAccount(const Date &date, const string &id, double rate): id(id), balance(0), rate(rate), lastDate(date), accumulation(0)

{
    date.show();
    cout <<  "	#" << id << "  created" << endl;

}

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

{

    accumulation = accumulate(date);

    lastDate = date;

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

    balance += amount;

    total += amount;
    date.show();

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

}
void SavingsAccount::error(const string &msg)const

{

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

}

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

{

    record(date, amount,desc);

}

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

{

    if (amount > getBalance())
        error("not enough money");
        //cout << "Error:not enough money" << endl;

    else

        record(date, -amount,desc);

}

void SavingsAccount::settle(const Date &date)

{

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

    if (interest != 0)

        record(date, interest,"interest");

    accumulation = 0;

}

void SavingsAccount::show() const

{

    cout  << id << "	Balance:" << balance;

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

    //建立几个账户
    SavingsAccount accounts[] = {

    SavingsAccount(date, "03755217", 0.015),

    SavingsAccount(date, "02342342", 0.015)


    };
    const int n = sizeof(accounts) / sizeof(SavingsAccount);//账户总数


    //11月的几笔账目

    accounts[0].deposit(Date(2008, 11, 5), 5000, "salary");
    accounts[1].deposit(Date(2008, 11, 25), 10000, "sell stock 0323");
    //12月的几笔账目
    accounts[0].deposit(Date(2008, 12, 5), 5500, "salary");
    accounts[1].withdraw(Date(2008, 12, 20), 4000, "buy a laptop");
    //结算所有的账户并输出各个账户信息
    cout << endl;
    for (int i = 0;i < n;i++) {
        accounts[i].settle(Date(2009, 1, 1));
        accounts[i].show();
        cout << endl;
    }
    cout << "Total: " << SavingsAccount::getTotal() << endl;
    return 0;
}

ps：

配套教材：郑莉《c++程序设计语言》

课程：学堂在线《c++程序设计语言》