【第五章】 个人银行账户管理程序 案例实现
//5_11.cpp
#include"account.h"
#include<iostream>
#include"account.cpp"
using namespace std;
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);
//开户后第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;
cout << "Total:" << SavingsAccount::getTotal() << endl;
return 0;
}
1 // account.cpp : Defines the entry point for the console application. 2 3 4 5 #ifndef _ACCOUNT_H_ 6 7 #define _ACCOUNT_H_ 8 9 class SavingsAccount //储蓄账户类 10 11 { 12 13 private: 14 15 int id; //账号 16 17 double balance; //余额 18 19 double rate; //存款的年利率 20 21 int lastDate; //上次变更余额的日期 22 23 double accumulation; //余额按日累加之和 24 25 static double total; //所有账户的总金额 26 27 //记录一笔账，date为日期，desc为说明 28 29 void record(int date, double amount); 30 31 //获得到指定日期为止的存款金额按日累积值 32 33 double accumulate(int date) const 34 35 { 36 37 return accumulation + balance*(date - lastDate); 38 39 } 40 41 public: 42 43 //构造函数 44 45 SavingsAccount(int date, int id, double rate); 46 47 int getId() const { return id; } 48 49 double getBalance() const { return balance; } 50 51 double getRate() const { return rate; } 52 53 static double getTotal() { return total; } 54 55 void deposit(int date, double amount); //存入现金 56 57 void withdraw(int date, double amount); //取出现金 58 59 //结算利息，每年1月1日调用一次该函数 60 61 void settle(int date); 62 63 //显示账户信息 64 65 void show() const; 66 67 }; 68 69 #endif//_ACCOUNT_H_
1 //account.cpp 2 3 #include"account.h" 4 5 #include<cmath> 6 7 #include<iostream> 8 9 using namespace std; 10 11 double SavingsAccount::total = 0; 12 13 //SavingsAccount类相关成员函数的实现 14 15 SavingsAccount::SavingsAccount(int date, int id, double rate) 16 17 : id(id), balance(0), rate(rate), lastDate(date), accumulation(0) 18 19 { 20 21 cout << date << " #" << id << " is created" << endl; 22 23 } 24 25 void SavingsAccount::record(int date, double amount) 26 27 { 28 29 accumulation = accumulate(date); 30 31 lastDate = date; 32 33 amount = floor(amount * 100 + 0.5) / 100; //保留小数点后两位 34 35 balance += amount; 36 37 total += amount; 38 39 cout << date << " #" << id << " " << amount << " " << balance << endl; 40 41 } 42 43 void SavingsAccount::deposit(int date, double amount) 44 45 { 46 47 record(date, amount); 48 49 } 50 51 void SavingsAccount::withdraw(int date, double amount) 52 53 { 54 55 if (amount>getBalance()) 56 57 cout << "Error:not enough money" << endl; 58 59 else 60 61 record(date, -amount); 62 63 } 64 65 void SavingsAccount::settle(int date) 66 67 { 68 69 double interest = accumulate(date)*rate / 365; //计算年息 70 71 if (interest != 0) 72 73 record(date, interest); 74 75 accumulation = 0; 76 77 } 78 79 void SavingsAccount::show() const 80 81 { 82 83 cout << "#" << id << " Balance:" << balance; 84 85 }
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》