实验任务3：

"Complex.hpp"

#include<iostream>
#include<math.h>
using namespace std;
class Complex {
public:
    Complex(double x = 0, double y = 0) :real(x), imag(y) {};
    Complex(Complex const& 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 const &c1) {
        Complex c;
        c.real = real + c1.real;
        c.imag = imag + c1.imag;
        real = c.real;
        imag = c.imag;
    };
    friend Complex add(Complex c1, Complex c2);
    friend bool is_equal(Complex const c1, Complex const c2);
    friend double abs(Complex c);
private:
    double real;
    double imag;
};
void Complex::show()const {
    {
        if (imag == 0)
            cout << real;
        else if (imag >= 0)
            cout << real << "+" << imag << 'i';
        else
            cout << real << imag << "i";
    };
}
Complex add(Complex c1, Complex c2) {
    Complex c3;
    c3.real = c1.real + c2.real;
    c3.imag = c1.imag + c2.imag;
    return c3;
};
bool is_equal(Complex const c1, Complex const c2) {
    if (c1.real == c2.real && c1.imag == c2.imag)
        return true;
    else return false;
};
double abs(Complex c) {
    return sqrt(c.real * c.real + c.imag * c.imag);
};

 

task3.hpp

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

int main()
{
    using namespace std;

    Complex c1(2, 2);
    const Complex c2(3.5);
    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;
}

 

运行结果：

 

实验4：

“User.hpp”

#include<iostream>
#include<string>
using namespace std;
class User {
public:
    User(string n, string p = "111111", string e = "") :name(n), passwd(p), email(e) { ++count; };
    void set_email() {
        cout << "Enter e-mail address:";
        cin >> email;
        cout << endl;
        cout<< "email is set successfully..." << endl;
    };
    void change_passwd();
    void print_info() {
        cout << "name:" << name<<endl;
        cout << "passwd:******" << endl;
        cout << "email:" << email << endl;
    };
    static void print_n();
private:
    string name;
    string passwd;
    string email;
    static int count;
};
int User::count = 0;
void User::change_passwd() 
{
    string p;
    int i;
    cout << "Enter old passwd:";
    cin >> p;
    cout << endl;
    if(p != passwd)
    {
        for (i = 0; i <= 1; i++) 
        {
            cout << "passwd input error. Please re-enter again: ";
            cin >> p;
            cout << endl;
        }
            cout << "passwd input error. Please try again while" << endl;
    }
    else {
        cout << "Enter new passwd:";
        cin >> p;
        cout << endl;
        cout<< "new passwd is set successfully..." << endl;
        passwd = p;
    }
}
void User::print_n() {
    cout << "there are " << count << "users ." << endl;
}

task4.cpp

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

int main()
{
    using namespace std;

    cout << "testing 1......" << endl;
    User user1("Taylor", "19891213", "cat@gmail.com");
    user1.print_info();

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

    User::print_n();
}

运行结果：