//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 }