实验2

#pragma once
#include <iostream> 
#include<string>
#include<iomanip>
#include<cmath>
class Complex {
public:
    Complex() { real = 0; imag = 0; }
    Complex(double x) {real = x; imag = 0; }
    Complex(double x, double y){real = x; imag = y; }
    Complex(Complex& obj) { real = obj.real; imag = obj.imag; }
       
    double get_real()const { return real; }
    double get_imag()const { return imag; }
    Complex add(const Complex& obj) { Complex c; c.real = real + obj.real; c.imag = imag + obj.imag; return c; };
    void show() const { if (imag) { std::cout << real << imag << "i" ; }
    else { std::cout << real; }
    }

    friend Complex add(const Complex &a,const Complex &b);
    friend bool is_equal(const Complex &a,const Complex &b);
    friend double abs(const Complex& a);

private:
    double imag, real;

 

};

Complex add(const Complex &a, const Complex &b) {
    Complex c;
    c.real = a.real + b.real;
    c.imag = a.real + a.imag;
    return c;
 }
bool is_equal(const Complex& a, const Complex& b) {
    return (a.real == b.real) && (a.imag == b.imag);
}
double abs(const Complex& a)
{
    return sqrt(a.real * a.real + a.imag * a.imag);
}

#include"Complex.hpp"
#include<iostream>
void test() {
    using namespace std;
    Complex c1(33, -4);
    const Complex c2(5.5);
    Complex c3(c1);
    cout << "c1 = ";
    c1.show();
    cout << endl;
    cout << "c2 = ";
    c2.show();
    cout << endl; 
    cout << "c2.imag = " << c2.get_imag() << endl;
    cout << "c3 = "; 
    c3.show(); 
    cout << endl;
    cout << "abs(c1) = ";
    cout << abs(c1) << endl;
    cout << boolalpha; 
    cout << "c1 == c3 : " << is_equal(c1, c3) << endl; 
    cout << "c1 == c2 : " << is_equal(c1, c2) << endl; 
    Complex c4; c4 = add(c1, c2); 
    cout << "c4 = c1 + c2 = ";
    c4.show(); 
    cout << endl;
    c1.add(c2);
    cout << "c1 += c2, " << "c1 = ";
    c1.show();
    cout << endl; 
}

int main() { test(); }

#pragma once
#include <iostream>
#include<string>
using namespace std;

class User
{
public:
    User(string a) { name = a; password = "111111"; email = " "; }
    User(string a, string b, string c) { name = a; password = b; email = c; }
    void set_email();
    void change_password();
    void print_info();
    static int print_n();

private:
    string name, password, email;

};



 void User::change_password()
{
        cout << "Enter old passord:";
        int cnt = 3;
        while (cnt--)
        {
            string a;
            cin >> a;
            if (a != password)
            {
                cout << (cnt == 0 ? "password input error.Please try after a while\n" : "password input error.Please re-enter again:") ;
            }
            else
            {
                cout << "Enter new password:";
                cin >> password;
                cout << "new password is set successfully..." << endl;
                break;
            }
        }
}

 void User::set_email()
 {
     cout << "Enter email adress:";
     cin >> email;
     cout << "email is set succesfully..." << endl;

 }



 void User::print_info()
{
     int n = password.length();


    cout << "name:  " << name << endl;
    cout << "password:  ";
    for (int i = 0; i < n; i++)
    {
        cout << "*";
    }
    cout << endl;
    cout << "email:  " << email << endl;
}
int User::print_n() {
    static int x = 1;
    x++;
    cout << "there are " << x << " users." << endl;
    return x;
}

#include"User.hpp"
#include<iostream>
void test() {
    using std::cout;
    using std::endl;
    cout << "testing 1......\n";
    User user1("Jonny", "92197", "xyz@hotmail.com");
    user1.print_info();
    cout << endl << "testing 2......\n\n";

    User user2("Leonard");
    user2.change_password();
    user2.set_email();
    user2.print_info();

    cout << endl;
    User::print_n();
}

int main() { test(); }