实验二 类和对象（2）

实验任务4

task_4.cpp

 1 #include "Complex.hpp"
 2 #include <iostream>
 3 
 4 // 类测试
 5 void test() {
 6     using namespace std;
 7 
 8     Complex c1(6, -8);
 9     const Complex c2(9.0);
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 }

Complex.hpp

 1 #pragma once
 2 
 3 //Complex类的定义
 4 #include<iostream>
 5 #include<iomanip>
 6 
 7 using std::cout;
 8 using std::endl;
 9 
10 //Complex类的声明
11 
12 class Complex {
13 public:
14     Complex();
15     Complex(double a, double b);
16     Complex(double a);
17     Complex(const Complex& obj);
18     ~Complex() = default;
19 
20     //成员函数
21     double get_real() const{ return real; }
22     double get_imag() const{ return imag; }
23 
24     void show() const;
25     void add(Complex c2);
26 
27 
28     //友元函数
29     friend Complex add(Complex c1, Complex c2);
30 
31     friend bool is_equal(Complex c1, Complex c2);
32 
33     friend double abs(Complex c1);
34 private:
35     double real;
36     double imag;
37 };
38 
39 Complex::Complex() {
40     real = 0;
41     imag = 0;
42 }
43 Complex::Complex(double a, double b) {
44     real = a;
45     imag = b;
46 }
47 Complex::Complex(double a) {
48     real = a;
49     imag = 0;
50 }
51 Complex::Complex(const Complex& obj):real{obj.real},imag{obj.imag}{}
52 
53 void Complex::show() const {
54     if (imag > 0) {
55         cout << real << "+" << imag << "i" << endl;
56     }
57     else
58         if (imag == 0) {
59             cout << real << endl;
60         }
61         else
62         cout << real << imag << "i" << endl;
63 }
64 
65 void Complex::add(Complex c2){
66     real += c2.real;
67     imag += c2.imag;
68 }
69 
70 
71 
72 Complex add(Complex c1, Complex c2) {
73     Complex c4;
74     c4.real = c1.real + c2.real;
75     c4.imag = c1.imag + c2.imag;
76     return c4;
77 }
78 
79 bool is_equal(Complex c1, Complex c2) {
80     if (c1.real == c2.real && c1.imag == c2.imag)
81         return true;
82     else
83         return false;
84 }
85  
86 double abs(Complex c1) {
87     return sqrt(c1.real * c1.real + c1.imag * c1.imag);
88 }

已将测试数据改为：

　　c1(6,-8);  c2(9.0);

实验任务5

User.hpp

 1 #pragma once
 2 #include<iostream>
 3 #include<string>
 4 
 5 using std::cout;
 6 using std::endl;
 7 using std::string;
 8 using std::cin;
 9 
10 class User {
11 public:
12     User(string mz);
13     User(string mz, string mm, string yx);
14     ~User() = default;
15 
16     //成员函数
17     void set_email();
18     void change_passwd();
19     void print_info();
20     static void print_n();
21 
22 private:
23     string name;
24     string passwd;
25     string email;
26     static int count;       //静态数据成员声明
27 };
28 
29 int User::count = 0;        //静态数据成员定义和初始化，使用类名限定
30 
31 void User::print_n() { cout << "There are " << count << " Users." << endl; }
32 
33 
34 User::User(string mz) :name{ mz }, passwd{ "111111" }, email{""} { count++; }
35 
36 User::User(string mz, string mm, string yx) :name{ mz }, passwd{ mm }, email{ yx } { count++; }
37 
38 void User::set_email() {
39     string address;
40     cout << "enter email address:";
41     cin >> address;
42     email = address;
43     cout << "email is set successfully..." << endl;
44 }
45 void User::change_passwd() {
46     string old_passwd;
47     string new_passwd;
48     int t = 1;
49     cout << "enter old passwd:";
50     cin >> old_passwd;
51     do {
52         if (passwd == old_passwd) {
53             cout << "enter new passwd:";
54             cin >> new_passwd;
55             passwd = new_passwd;
56             break;
57         }
58         else
59         {
60             t++;
61             cout << "passwd input error.Please re-enter again:";
62             cin >> old_passwd;
63         }
64     } while (t < 3);
65     if (t == 3) {
66         cout << "passwd enter error.Please try after a while." << endl;
67     }
68 }
69 void User::print_info() {
70     int length = passwd.length();
71     cout << "name:   " << name << endl;
72     cout << "passwd: ";
73         while (length--) {
74             cout << "*";
75         }
76         cout << endl;
77     cout << "email:  " << email << endl;
78 }

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", "xyz@hotmail.com");
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     User::print_n();
21     cout << endl;
22 
23 }
24 
25 int main() {
26     test();
27 }

实验结论：

1、在编写代码的时候有意识的使用了hpp以及cpp的结构，使得结构更清晰明了

2、了解了count 这一static变量的使用方法

3、string s0{5，‘*’}在创建字符串时总是报错，，，不知道为什么

 

posted @ 2022-10-17 11:55  Z`x  阅读(32)  评论(0)    收藏  举报