实验1 类与对象

#ifndef COMPLEX_HPP
#define COMPLEX_HPP

#include <iostream>
#include <iomanip>
#include <string>
#include <cmath>

using namespace std;

class Complex{
    public:
        Complex(){}
        Complex(double real_):real(real_),imag(0){}
        Complex(double real_, double imag_):real(real_),imag(imag_){}
        Complex(const Complex &complex):real(complex.real),imag(complex.imag){}
        double get_real() const {return real;}
        double get_imag() const {return imag;}
        void show() const{
            if(imag>0){
                cout << real << " + " << imag << "i" ;
            }
            else if(imag==0){
                cout << real;
            }
            else{
                cout << real << " - " << -1*imag << "i";
            }
        }
        void add(Complex complex){
            real = real + complex.real;
            imag = imag + complex.imag;
        }
        friend Complex add(const Complex &complex1, const Complex &complex2){
            Complex complex;
            complex.real = complex1.get_real() + complex2.get_real();
            complex.imag = complex1.get_imag() + complex2.get_imag();
            return complex;
        }
        friend bool is_equal(const Complex &complex1, const Complex &complex2){
            if(complex1.real==complex2.real && complex1.imag==complex2.imag){
                return true;
            }
            else{
                return false;
            }
        }
        friend double abs(const Complex &complex){
            return sqrt(complex.real*complex.real+complex.imag*complex.imag);
        }
    private:
        double real;
        double imag;
};
#endif

#include "Complex.hpp"
#include <iostream>

int main()
{
    using namespace std;

    Complex c1(3, -4);
    const Complex c2(4.5);
    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;
}

 

#ifndef USER_HPP
#define USER_HPP

#include <iostream>
#include <iomanip>
#include <string>

using namespace std;

class User
{
public:
    User(string name_);
    User(string name_, string passwd_, string email_);
    void set_email(); 
    void change_passwd();
    void print_info();
    static void print_n();
private:
    string name;  
    string passwd;
    string email;
    static int count;  
};

int User::count = 0;

User::User(string name_): name{name_}, passwd{"111111"}, email{""}
{
    ++count;
}

User::User(string name_, string passwd_, string email_): name{name_}, passwd{passwd_}, email{email_}
{  
    ++count;
}

void User::set_email()
{
    cout << "Enter email address:";
    cin >> email;
    cout << "email is set successfully..." << endl;
}

void User::change_passwd()
{
    string passwd_;
    int flag=0;
    int countdown = 2;
    cout << "Enter old password:";
    cin >> passwd_;
    if(passwd==passwd_){
        flag=1;
    }
    while(flag==0&&countdown>0){
        countdown--;
        cout << "password input error. Please re-enter again:";
        cin >> passwd_;
        if(passwd==passwd_){
            flag=1;
            break;
        }
    }
    if(flag==1){
        cout << "Enter new passwd:";
        cin >> passwd;
        cout << "newpasswd is set successfully..." << endl;
    }
    else if(flag==0){
        cout << "password input error. Please try after a while." << endl;
    }
}

void User::print_info() 
{
    
    cout << "name:\t" << name << endl;
    cout << "passwd:\t" << "******" << endl;
    cout << "email:\t" << email <<endl;
}

void User::print_n()
{
    cout << "there are " << count << " users.\n";
}
#endif

#include "User.hpp"
#include <iostream>

int main()
{
    using namespace std;

    cout << "testing 1......" << endl;
    User user1("Jonny", "92197", "xyz@hotmail.com");
    user1.print_info();

    cout << endl
         << "testing 2......" << endl
         << endl;
    User user2("Leonard");
    user2.change_passwd();
    user2.set_email();
    user2.print_info();
    User::print_n();
}