C++ 第五章 个人银行账户管理程序案例

Posted 2020-10-10 Barry

【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 << "\t#" << 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 << "\t#" << id << "\t" << amount << "\t" << 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 << "\tBalance:" << 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》