实验2 类与对象（2）

实验结论：

实验任务四：

Complex.hpp:

#pragma once
#include <iostream>
#include<math.h> 
using namespace std;
class  Complex {
public:
    Complex(double r = 0, double i = 0)  :real{ r }, imag{ i } {};
    Complex(const Complex& c) :real{ c.real }, imag{ c.imag } {};
    double get_real() const {
        return real;
    };
    double get_imag()const {
        return imag;
    };
    void show() const;
    
    void add(Complex c1) {

        real += c1.real; imag += c1.imag;
        
    };


    friend double abs(Complex c) {

        return sqrt(c.real * c.real + c.imag * c.imag);

    }
    friend bool is_equal(Complex c1, Complex c2) {
        if (c1.real == c2.real && c1.imag == c2.imag) { return 1; }
        else { return 0; }
    };

    friend Complex add(Complex c1, Complex c2) { Complex c; c.real = c1.real + c2.real; 
    c.imag = c1.imag + c2.imag; return c;
    };
    

private:
     double real, imag;

};
void Complex::show() const {
    if (imag >= 0) {
        cout << real << "+" << imag << "i";
    }
    else { cout << real << imag << "i"; };

}

task 4:

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

void test() {
    using namespace std;

    Complex c1(5, 12);
    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;
}

int main() {
    test();
}

运行结果：

实验任务5：

User.hpp

#pragma once
#include <iostream>
#include<string>
using namespace std;
class User {
public:
    User(string name, string passwd = "111111", string email = "") :name{ name }, passwd{ passwd }, email{email} { count++; };
    void print_info() {
       
        cout << name << endl;
        string s2(passwd.length(), '*');
        cout << s2 << endl;
        cout << email << endl;
    };
    static void print_n() { cout <<"there are" <<" "<< count <<" users" << endl; };
    void set_email() {
        email = "";
        cout << "enter email address:";
        cin >> email;
        cout << "email is set successfully...." << endl;
        ; };
    void change_passwd(){
        int i; string s1;
        cout << "Enter old password:";
       
        for (i=0;i<3;i++) {
            cin >> s1;
            if (s1 == passwd) {
                cout << " Enter new password:";
                cin >> passwd;
                cout << "new passwd is set successfully...." << endl;
                break;
            }
            else  {
                cout << "password input error.Please re-enter again:";

            }
           
        }
        if (i == 3) {

            cout << "password input error.Please try after awhile" << endl;
        };
    
    }
private:
    string name;
    string passwd;
    string email;
    static int count;
};

int User::count = 0;

task 5:

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

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

int main() {
    test();
}

测试1：

测试2：