编程练习答案——第10章

 1 // chapter10_1_account.h
 2 
 3 #ifndef LEARN_CPP_CHAPTER10_1_ACCOUNT_H
 4 #define LEARN_CPP_CHAPTER10_1_ACCOUNT_H
 5 
 6 #include <iostream>
 7 #include <string>
 8 
 9 
10 class Account {
11 private:
12     std::string name_;
13     std::string id_;
14     double deposit_;
15 public:
16     Account();
17     Account(std::string,std::string,double);
18     void show() const;
19     bool in(double);
20     bool out(double);
21 };
22 
23 
24 #endif //LEARN_CPP_CHAPTER10_1_ACCOUNT_H
25 
26 // chapter10_1_account.cpp
27 
28 #include "chapter10_1_account.h"
29 
30 Account::Account() {
31     name_ = "none";
32     id_ = "none";
33     deposit_ = 0;
34 }
35 
36 Account::Account(std::string name, std::string id, double deposit) {
37     name_ = name;
38     id_ = id;
39     deposit_ = deposit;
40 }
41 
42 void Account::show() const {
43     using namespace std;
44     cout.precision(16);
45     cout << "account info: " << endl
46         << "	name: " << name_ << endl
47         << "	id: " << id_ << endl
48         << "	deposit: " << deposit_ << endl;
49 }
50 
51 bool Account::in(double n) {
52     if (n <= 0)
53         return false;
54     else
55         deposit_ += n;
56     return true;
57 }
58 
59 bool Account::out(double n) {
60     if (deposit_ < n)
61         return false;
62     else
63         deposit_ -= n;
64     return true;
65 }
66 
67 // run
68 
69 void ch10_1() {
70     Account a;
71     a.show();
72     Account b{"kxgkhy","4523452345",1000.123};
73     b.show();
74     b.in(123.123);
75     b.show();
76     b.out(123.123);
77     b.show();
78 }