Task4：
Complex.hpp
1 #pragma once
2
3 //Complex类的定义
4 #include<iostream>
5 #include<string>
6 #include<math.h>
7
8 using std::cout;
9 using std::endl;
10
11 //Complex类的声明
12 class Complex {
13 public:
14 Complex(double r = 0, double i = 0);
15 Complex(const Complex& c);
16 ~Complex();
17 double get_real() const { return real; }
18 double get_imag() const { return imag; }
19 void show() const;
20 void add(const Complex& c);
21 friend Complex add(const Complex& c1, const Complex& c2);
22 friend bool is_equal(const Complex& c1, const Complex& c2);
23 friend double abs(const Complex& c);
24
25 private:
26 double real, imag;
27 };
28
29
30 //构造函数
31 Complex::Complex(double r, double i) :real{ r }, imag{ i } {}
32
33 //复制构造函数
34 Complex::Complex(const Complex& c) :real{ c.real }, imag{ c.imag } {}
35
36 //析构函数
37 Complex::~Complex() {}
38
39
40 //非成员函数
41 void Complex::show()const {
42 if (imag > 0)
43 cout << real << " + " << imag << "i";
44 else if (imag == 0)
45 cout << real;
46 else
47 cout << real << " - " << -imag << "i";
48 }
49
50 void Complex::add(const Complex& c)
51 {
52 real += c.real;
53 imag += c.imag;
54 }
55
56 //友元函数
57 Complex add(const Complex& c1, const Complex& c2) {
58 Complex c3;
59 c3.add(c1);
60 c3.add(c2);
61 return c3;
62 }
63
64 bool is_equal(const Complex& c1, const Complex& c2) {
65 if (c1.real == c2.real && c1.imag == c2.imag)
66 return true;
67 else
68 return false;
69 }
70
71 double abs(const Complex& c) {
72 return sqrt(c.real * c.real + c.imag * c.imag);
73 }
task4.cpp
1 #include"Complex.hpp"
2 #include<iostream>
3
4 //类测试
5 void test() {
6 using namespace std;
7
8 Complex c1(3, -4);
9 const Complex c2(4.5);
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 c1.show();
41 cout << endl;
42 }
43
44 int main() {
45 test();
46 }
结果截图：
（1）原测试结果
（2）更换数据：
Task5
User.hpp
1 #pragma once
2
3 #include<iostream>
4 #include<iomanip>
5
6 using std::cout;
7 using std::cin;
8 using std::endl;
9 using std::string;
10 using std::left;
11 using std::setw;
12
13 class User {
14 public:
15 User(string na, string pa = "111111", string em = "");
16 ~User();
17 void set_email();
18 void change_passwd();
19 void print_info();
20 static void print_n();
21
22 private:
23 string name, passwd, email;
24 static int n;
25 };
26
27 User::User(string na, string pa, string em) {
28 name = na;
29 passwd = pa;
30 email = em;
31 n++; }
32 User::~User() {
33 n--;
34 }
35 void User::set_email() {
36 cout << "Enter email address: ";
37 cin >> email;
38 cout << "email is set successfully..." << endl;
39 }
40 void User::change_passwd() {
41 int num = 0;
42 cout << "Enter old password: ";
43 string input_passwd;
44 while (1) {
45 cin >> input_passwd;
46 if(input_passwd == passwd)
47 {
48 cout << "Enter new password: ";
49 cin >> passwd;
50 cout << "new password is set successfully..." << endl;
51 break;
52 }
53 else {
54 num++;
55 if (num < 3) {
56 cout << "password input error. Please re-enter again: ";
57 continue;
58 }
59 else {
60 cout << "password input error. Please try after a while. " << endl;
61 break;
62 }
63 }
64 }
65 }
66 void User::print_info() {
67 cout << left
68 << setw(8) << "name: " << name << endl
69 << setw(8) << "passwd: ";
70 for (int i = 0; i < passwd.size(); i++) {
71 cout << "*";
72 }
73 cout << endl
74 << setw(8) << "email: " << email << endl;
75 }
76 int User::n = 0;
77 void User::print_n() {
78 if (n == 1)
79 cout << "there is 1 user." << endl;
80 else {
81 cout << "there are " << n << " users. " << endl;
82 }
83 }
task5.cpp
1 #include "User.hpp"
2 #include <iostream>
3
4 // 测试User类
5 void test() {
6 using std::cout;
7 using std::endl;
8
9 cout << "testing 1......\n";
10 User user1("Jonny", "92197", "[email protected]");
11 user1.print_info();
12
13 cout << endl
14 << "testing 2......\n\n";
15
16 User user2("Leonard");
17 user2.change_passwd();
18 user2.set_email();
19 user2.print_info();
20
21 cout << endl;
22 User::print_n();
23 }
24
25 int main() {
26 test();
27 }
结果截图：
测试一：
测试二：
测试三：
标签：std,const,cout,对象,Complex,实验,User,using From： https://www.cnblogs.com/lwhhhh/p/16805103.html