实验2 类和对象（2）

实验结论

实验任务4

 1 #pragma once
 2 #include<iostream>
 3 #include<cmath>
 4 using namespace std;
 5 class Complex{
 6     public:
 7         Complex(double r=0.0,double i=0.0);
 8         Complex(const Complex &obj): real{obj.real}, imag{obj.imag} {}
 9         double get_real() const;
10         double get_imag() const;
11         void show() const;
12         void add(Complex c);
13         friend Complex add(Complex c1, Complex c2);
14         friend bool is_equal(Complex c1, Complex c2);
15         friend double abs(Complex c);
16 
17     private:
18         double real;
19         double imag;
20 
21 };
22 
23 Complex::Complex(double r, double i):real{r},imag{i} {}
24 double Complex::get_real() const {return real;}
25 double Complex::get_imag() const {return imag;}
26 void Complex::show() const {
27     cout << Complex::get_real();
28     if(get_imag() > 0) cout << " + "<< Complex::get_imag() << "i" <<endl;
29     else if(get_imag() < 0)  cout << " - "<< Complex::get_imag()*-1 << "i" <<endl;
30     else cout << endl;
31 }
32 void Complex::add(Complex c) {
33     real += c.get_real();
34     imag += c.get_imag();
35 }
36 Complex add(Complex c1, Complex c2){
37     return Complex(c1.real + c2.real, c1.imag + c2.imag);
38 }
39 bool is_equal(Complex c1, Complex c2){
40     if(c1.real == c2.real && c1.imag == c2.imag) return true;
41     else return false;
42 }
43 double abs(Complex c){
44     return sqrt(c.real*c.real+c.imag*c.imag);
45 }
Complex.hpp

 

 

 

 实验任务4

 

 

 实验任务5

 1 #include<iostream>
 2 #include<string>
 3 #include<iomanip>
 4 using namespace std;
 5 class User{
 6 public:
 7     User(string name0, string password0 = "111111", string email0 = " ");
 8     void set_email();
 9     void change_passwd();
10     void print_info() const;
11     void static print_n();
12 private:
13     string name,password,email;
14     static int count;
15 
16 };
17 
18 int User::count = 0;
19 User::User(string name0, string password0, string email0):
20     name{name0},password{password0},email{email0} {
21         count++;}
22 
23 void User::set_email(){
24     cout << "Enter email address: ";
25     cin >> email;
26     cout << "email is set successfully..." << endl;
27 
28 }
29 
30 void User::change_passwd(){
31     int times=0;
32     cout << "Enter old password: ";
33     while(times++ < 3){
34         string s1;
35         cin >> s1;
36         if(s1 == password ){
37             cout << "Enter new passwd: ";
38             cin >> password;
39             cout << "new passwd is set successfully..." << endl;
40             break;
41         }
42         else if(times < 3) cout << "password input error. Please re-enter again: ";
43     }
44     if(times >= 3) cout << "password input error. Please try after a while."<<endl;
45 }
46 
47 void User::print_info() const{
48     string s1(password.length(), '*');
49     cout << left << setw(8) << "name:" << name << endl;
50     cout << left <<  setw(8) << "passwd:" << s1 << endl;
51     cout << left << setw(8) << "email:" << email << endl;
52 }
53 void User::print_n() {cout <<"there are "<< count << " users" <<endl;}
User.hpp

实验任务5（1）

 

 实验任务5（2）

 实验总结

1.函数调用静态变量时需声明为静态函数

posted @ 2022-10-14 17:14  xrzjjy  阅读(28)  评论(0)    收藏  举报