// 4-10个人银行账户管理系统.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
#include <iostream>
#include <cmath>
using namespace std;
class SavingsAccount {//存储账户类
private:int id;          //账号double balance;  //余额double rate;     //年利率int lastDate;     //上次变余额的日期double accumulation;//余额按日累加之和//记录一笔账，date为日期，amount为金额，desc为说明void record(int date, double amount);//获得到指定日期为止的存款金额按日累积值double accumulate(int date) const {return accumulation + balance * (date - lastDate);}
public://构造函数SavingsAccount(int date, int id, double rate);int getId() { return id;}double getBalance() { return balance; }double getRate() { return rate; }void deposit(int date, double amount);//存入现金void withdraw(int date, double amount);//取出现金//结算利息，每年的1月1日调用一次该函数void settle(int date);//显示账户信息void show();
};
//SavingsAccount类相关函数成员的实现
SavingsAccount::SavingsAccount(int date, int id, double rate):id(id), balance(0), rate(rate), lastDate(date), accumulation(0) {cout << date << "\t#" << id << "is created" << endl;}
void SavingsAccount::record(int date, double amount) {accumulation = accumulate(date);lastDate = date;amount = floor(amount * 100 + 0.5) / 100;//保留小数点后两位balance += amount;cout << date << "\t#" << id << "\t" << amount << "\t" << balance << endl;
}
void SavingsAccount::deposit(int date, double amount) {record(date, amount);
}
void SavingsAccount::withdraw(int date, double amount) {if (amount > getBalance())cout << "Error: notenough money" << endl;elserecord(date, -amount);
}
void SavingsAccount::settle(int date) {double interest = accumulate(date) * rate / 365;//计算年息if (interest != 0)record(date, interest);accumulation = 0;
}
void SavingsAccount::show() {cout << "#" << id << "\tBalance:" << balance;
}
int main() {//建立几个账户SavingsAccount sa0(1, 21325302, 0.015);SavingsAccount sa1(1, 58320212, 0.015);//几笔账目sa0.deposit(5, 5000);sa1.deposit(25, 10000);sa0.deposit(45, 5500);sa1.withdraw(60, 4000);//开户后90天到了银行的计息日，结算所有账户的年息sa0.settle(90);sa1.settle(90);//输出各个账户信息sa0.show();cout << endl;sa1.show();cout << endl;return 0;
}