【第七章】 個人銀行賬戶管理程序 案例實現
//account.cpp
#include"account.h"
#include<cmath>
#include<iostream>
using namespace std;
double Account::total = 0;
//Account類相關成員函數的實現
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; //保留小數點后兩位
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類相關成員函數的實現
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)); //計算年息
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 //儲蓄賬戶類
{
private:
std::string id; //賬號
double balance; //余額
static double total; //所有賬戶的總金額
protected:
Account(const Date&date, const std::string &id);
//記錄一筆賬，date為日期，desc為說明,amount為金額
void record(const Date &date, double amount, const std::string &desc);
//報告錯誤信息
void error(const std::string &msg)const;
public:
//構造函數
const std::string &getId() const { return id; }
double getBalance() const { return balance; }
static double getTotal() { return total; }
void show() const;//顯示賬戶信息
};
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); //存入現金
void withdraw(const Date &date, double amount, const std::string &desc); //取出現金
void settle(const Date &date);//結算利息，每年1月1日調用一次該函數
};
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); //存入現金
void withdraw(const Date &date, double amount, const std::string &desc); //取出現金
void settle(const Date &date);//結算利息，每年1月1日調用一次該函數
void show() const;//顯示賬戶信息
};
#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銀行賬戶.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);
//建立幾個賬戶
SavingsAccount sa1(date, "03755217", 0.015);
SavingsAccount sa2(date, "02342342", 0.015);
CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
//11月的幾筆賬目
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");
//結算信用卡
ca.settle(Date(2008, 12, 1));
//12月的幾筆賬目
ca.deposit(Date(2008, 12, 1), 2016, "repay the credit");
sa1.deposit(Date(2008, 12, 1), 5500, "salary");
//結算所有的賬戶並輸出各個賬戶信息
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：
配套教材：鄭莉《c++程序設計語言》
課程：學堂在線《c++程序設計語言》