实验二 类与对象（2)

任务4：

　　Complex.hpp

#pragma once
#include<bits/stdc++.h>
using namespace std;
class Complex{
    public:
        Complex (double r=0,double i=0):real{r},imag{i}{} ;
        Complex (const Complex &p):real{p.real},imag{p.imag}{} ;
        double get_real() const{return real;}
        double get_imag() const{return imag;}
        void show() const;
        void add(const Complex &p) ;
        friend Complex add(const Complex &p1,const Complex &p2) ;
        friend bool is_equal(const Complex &p1,const Complex &p2) ;
        friend double abs(Complex &p) ;
        private:
            double real,imag;
};
void Complex::show()const {
    if (imag > 0)
        cout << real << "+" << imag << "i";
    if (imag < 0)
        cout << real << imag << "i"  ;
    if (imag == 0)
        cout << real ;
}
void Complex::add(const Complex &p){
    real=real+p.real;
    imag=imag+p.imag;
}
Complex add(const Complex& p1, const  Complex& p2) {
    Complex p;
    p.real =p1.real + p2.real;
    p.imag = p1.imag +p2.imag;
    return p;
}
bool is_equal(const Complex &p1,const Complex &p2){
    if(p1.real==p2.real&&p1.imag==p2.imag){
        return true;
    }
    else return false;
}
double abs(Complex &p){
     return sqrt(p.real*p.real+p.imag*p.imag);
}

　　main.cpp

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


void test() {
    using namespace std;

    Complex c1(4, -5);
    const Complex c2(2.7);
    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();
}

 

任务5：

　　

#pragma once
#include<iostream>
#include<string>
using namespace std;
class User{
    public:
    User(string n0,string p0="111111",string e0 ="");
     void set_email();
     void change_passwd();
     void print_info() const;
     static void print_n();
     
     private:
     string name,passwd,email;
     static int n;
};
int User::n = 0;
User::User(string n0,string p0,string e0):name{n0},passwd{p0},email{e0}{
    n++;
}

void User::set_email(){
    cout << "Enter emal address: ";
    cin >> email;
    cout << "email is set successfully..." << endl;
}
void User::change_passwd(){
    string old_password;
    int count =1;
    cout << "Enter old password: ";
    while(count<=3){
        cin >> old_password;
        if(old_password==passwd){
        cout << "Enter new passwd: ";
        cin >> passwd;
        cout << "new passwd is set successfully..." << endl;
        break;
        }
        else{
            if(count!=3){
            cout << "password input error.Please re-enter again: ";
        }
            else{
            cout << "password input error.Please try after a while" << endl;
        } 
            count++;
        }
    }
    
}
void User::print_info() const{
    cout << "name: " << name << endl;
    cout << "passwd: ";
    for (int i = 0; i < passwd.length(); i++)
         cout << "*";
         cout << endl;
         cout << "eamil: " << email << endl;
}
void User::print_n(){
    cout << "there are " << n << " users.";
}

　　task5.cpp

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_passwd();
    user2.set_email();
    user2.print_info();

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

int main() {
    test();
}