实验1

 

#ifndef COMPLEX_HPP
#define COMPLEX_HPP
#include <iostream>
#include <iomanip>
#include <string>
#include <math.h>
using namespace std;
class Complex
{
public:
    Complex(){
    };
    Complex(double r,double i);
    Complex(double r);
    Complex(const Complex &c);
    ~Complex(){};
    double get_real() const;
    double get_imag() const;
    void show() const;
    void add(const Complex &c);
    friend Complex add(const Complex &c1,const Complex &c2);
    friend bool is_equal(const Complex &c1,const Complex &c2);
    friend double abs(const Complex &c);
private:
    double real;
    double imag;
};
Complex::Complex(double r,double i):real(r),imag(i){}
Complex::Complex(double r):real(r),imag(0.0){}
Complex::Complex(const Complex &c):real(c.real),imag(c.imag){}
double Complex::get_real() const{
    return real;
}
double Complex::get_imag() const{
    return imag;
}
void Complex::show() const{
    if(imag>0)
        cout<<real<<"+"<<imag<<"i";
        else if(imag==0)
        cout<<real;
    else
        cout<<real<<imag<<"i";
}
void Complex::add(const Complex &c){
    real+=c.real;
    imag+=c.imag;
}
Complex add(const Complex &c1,const Complex &c2){
    Complex c;
    c.imag=c1.imag+c2.imag;
    c.real=c1.real+c2.real;
    return c;
}
bool is_equal(const Complex &c1,const Complex &c2){
    if (c1.imag==c2.imag)
        return true;
    else
        return false;
}
double abs(const Complex &c){
    return sqrt(c.imag*c.imag+c.real*c.real);
}
#endif

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

int main()
{
    using namespace std;

    Complex c1(1, -1);
    const Complex c2(1.5);
    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;
}

 

#include<iostream>
using namespace std;
class User
{
public:
    User(string a, string p = "111111", string e = "") : name(a), password(p), email(e) { n++; }
    User(User& u) : name(u.name), password(u.password), email(u.email) { n++; }
    void set_email()
    {
        cout << "Enter email address:";
        cin >> email;
        cout << "email is set sucessfully..." << endl;
    }
    void change_passwd();
    void print_info()
    {
        cout << "name: " << name << endl;
        cout << "passwd:******" << endl;
        cout << "email :" << email << endl;
    }
    static void print_n()
    {
        cout << "there are " << n << " users." << endl;
    }
    ~User() { n--; }
private:
    string name;
    string password;
    string email;
    static int n;
};

int User::n = 0;

void User::change_passwd()
{
    int i = 0;
    string temp;
    while (i != 3)
    {
        if (i == 0)
            cout << "Enter old password:";
        else
            cout << "Please re-enter again:";
        cin >> temp;
        if (temp == password)
        {
            cout << "Enter new password:";
            cin >> password;
            while (password.length() != 6 || password.find('@') == -1)
            {
                cout << "The new password is wrong.";
                cout << "Please input again:";
                cin >> password;
            }
            cout << "new password is set sucessfully..." << endl;
            return;
        }
        else
        {
            cout << "password input error.";
            i++;
        }
    }
    if (i == 3)
        cout << "Please try after a while." << endl;
}

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

int main()
{
    using namespace std;

    cout << "testing 1......" << endl;
    User user1("hahha", "12345", "1234@bb.com");
    user1.print_info();

    cout << endl
        << "testing 2......" << endl
        << endl;
    User user2("Abc");
    user2.change_passwd();
    user2.set_email();
    user2.print_info();

    User::print_n();
}