任务四代码：
Complex.hpp文件源码：
1 #pragma once
2
3 //Complex类的定义
4 #include<iostream>
5 #include<cmath>
6
7 using namespace std;
8
9 class Complex
10 {
11 public:
12 Complex(double real0 = 0, double imag0 = 0);
13 Complex(const Complex& c);//复制构造函数
14 ~Complex() = default;//析构函数
15
16 double get_real() const ;//返回复数实部
17 double get_imag() const ;//返回复数虚部
18 void show() const ;//用于输出复数
19 void add(Complex const& c);//将一个复数加到自身
20
21 friend Complex add(Complex const& c1, Complex const& c2);//两个复数相加
22 friend bool is_equal(Complex const& c1, Complex const& c2);//判断两个复数是否相等
23 friend double abs(Complex const& c);//取模
24
25 private:
26 double real;
27 double imag;
28 };
29
30 //带参数的构造函数
31 Complex::Complex(double real0, double imag0) :real(real0), imag(imag0){}
32
33 //复制构造函数
34 Complex::Complex(const Complex& c) : real{ c.real }, imag{ c.imag }{}
35
36 //返回复数实部
37 double Complex::get_real() const
38 {
39 return real;
40 }
41
42 //返回复数虚部
43 double Complex::get_imag() const
44 {
45 return imag;
46 }
47
48 //输出复数
49 void Complex::show() const
50 {
51 if (real != 0 && imag != 0)
52 cout << real << imag << " i " ;
53 else if (real == 0 && imag != 0)
54 cout << imag << " i " ;
55 else if (real != 0 && imag == 0)
56 cout << real ;
57 else
58 cout << "0" ;
59 }
60
61 //将一个复数加到自身
62 void Complex::add(Complex const& c)
63 {
64 real += c.real;
65 imag += c.imag;
66 }
67
68 //两个复数相加
69 Complex add(Complex const& c1, Complex const& c2)
70 {
71 Complex c3;
72 c3.real = c1.real + c2.real;
73 c3.imag = c1.imag + c2.imag;
74 return c3;
75 }
76
77 //两个复数是否相等
78 bool is_equal(Complex const& c1, Complex const& c2)
79 {
80 if (c1.real == c2.real && c1.imag == c2.imag)
81 return true;
82 else
83 return false;
84 }
85
86 //取模
87 double abs(Complex const& c)
88 {
89 return sqrt(c.real * c.real + c.imag * c.imag);
90 }
task4.cpp源码：
1 #include "Complex.hpp"
2 #include <iostream>
3
4 // 类测试
5 void test() {
6 using namespace std;
7
8 Complex c1(5, -2);
9 const Complex c2(2.5);
10 Complex c3(c1);
11
12 cout << "c1 = ";
13 c1.show();
14 cout << endl;
15
16 cout << "c2 = ";
17 c2.show();
18 cout << endl;
19 cout << "c2.imag = " << c2.get_imag() << endl;
20
21 cout << "c3 = ";
22 c3.show();
23 cout << endl;
24
25 cout << "abs(c1) = ";
26 cout << abs(c1) << endl;
27
28 cout << boolalpha;
29 cout << "c1 == c3 : " << is_equal(c1, c3) << endl;
30 cout << "c1 == c2 : " << is_equal(c1, c2) << endl;
31
32 Complex c4;
33 c4 = add(c1, c2);
34 cout << "c4 = c1 + c2 = ";
35 c4.show();
36 cout << endl;
37
38 c1.add(c2);
39 cout << "c1 += c2, " << "c1 = ";
40
41 c1.show();
42 cout << endl;
43 }
44 int main() {
45 test();
46 }
任务四运行截图：
任务五代码：
User.hpp文件源码：
1 #pragma once
2
3 //User类的定义
4 #include<iostream>
5 #include<string>
6
7 using namespace std;
8 class User
9 {
10 public:
11 User(string name0, string passwd0 = "111111", string email0 = "");//构造函数
12 ~User() = default;//析构函数
13
14 void set_email();//设置邮箱
15 void change_passwd();//修改密码
16 void print_info() const;//打印用户信息
17 static void print_n();//打印用户总数
18
19 private:
20 string name, passwd, email;
21 static int n;
22 };
23
24 int User::n = 0;
25
26 //构造函数
27 User::User(string name0,string passwd0,string email0)
28 {
29 name = name0;
30 passwd = passwd0;
31 email = email0;
32 n++;
33 }
34
35 //设置邮箱
36 void User::set_email()
37 {
38 cout << "Enter email address: ";
39 cin >> email;
40 cout << "email is set successfully..." << endl;
41 }
42
43 //修改密码
44 //修改密码前，要求先输入旧的密码，验证无误后，才允许修改；如果输入旧密码时，连续三次输入错误，则提示用户稍后再试，暂时退出修改密码程序。
45 void User::change_passwd()
46 {
47 string old_passwd;
48 int count = 0;
49 cout << "Enter old password: ";
50 while (count != 3)
51 {
52 cin >> old_passwd;
53 if (old_passwd==passwd)
54 {
55 cout << "Enter new passwd: ";
56 cin >> passwd;
57 cout << "new passwd is set successfully..." << endl;
58 break;
59 }
60 else
61 {
62 count++;
63 if (count != 3)
64 cout << "password input error.Please re-enter again: ";
65 else
66 cout << "password input error.Please try after a while." << endl;
67 }
68 }
69
70 }
71
72 //打印用户信息
73 //打印用户名、密码、联系邮箱。其中，密码以与真实密码相同位数的*显示，比如密码为12345，则显示 *****。
74 void User::print_info() const
75 {
76 cout << "name: " << name << endl
77 << "passwd: ";
78 for (int i = 0; i < passwd.length(); i++)
79 cout << "*";
80 cout << endl
81 << "email: " << email << endl;
82 }
83
84 //打印用户总数
85 void User::print_n()
86 {
87 cout << "there are " << n << " users.";
88 }
task5.cpp源码：
1 #include "User.hpp"
2 #include<iostream>
3
4 //调试User类
5 void test()
6 {
7 using std::cout;
8 using std::endl;
9
10 cout << "testing 1......\n";
11 User user1("Brown", "980525", "[email protected]");
12 user1.print_info();
13
14 cout << endl
15 << "testing 2......\n\n";
16
17 User user2("Yellow");
18 user2.change_passwd();
19 user2.set_email();
20 user2.print_info();
21
22 cout << endl;
23 User::print_n();
24 }
25
26 int main()
27 {
28 test();
29 }
任务五运行截图：
标签：const,cout,对象,double,void,Complex,实验,User From： https://www.cnblogs.com/jane-d/p/16792822.html