实验二

• 实验任务4

Complex.hpp文件源码：

#pragma once
#include<iostream>
using namespace std;
class Complex {
public:
    Complex();
    Complex(double real0, double imag0=0);
    Complex(const Complex& obj);
    double get_real()const { return real; }
    double get_imag()const { return imag; }
    void show()const;
    void add(Complex temp);
    friend Complex add(Complex c1, Complex c2);
    friend bool is_equal(Complex c1, Complex c2);
    friend double abs(Complex c1);
private:
    double real;
    double imag;
};
Complex::Complex():real{0},imag{0}{}

Complex::Complex(double real0,double imag0):real{real0},imag{imag0}{}
Complex::Complex(const Complex&obj):real{obj.real},imag{obj.imag}{}
 void Complex::show()const {
     if (imag == 0)
         cout << real;
     else
         cout << real << imag << "i";
}
void Complex:: add(Complex temp) {
    real += temp.real;
    imag += temp.imag;
}
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 c1, Complex c2) {
    if (c1.imag = c2.imag && c1.real == c2.real)
        return 1;
    else
        return 0;
}
double abs(Complex c1) {
    return sqrt((c1.real * c1.real + c1.imag * c1.imag));
}

 

task4.cpp源码：

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

// 类测试
void test() {
    using namespace std;

    Complex c1(6, -8);
    const Complex c2(6.8);
    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：

• 实验任务五

 User.hpp:

#pragma once
#include<iostream>
#include<iomanip>
#include<string>
using namespace std;
class User {
public:
    User(string name0, string passwd0 = "111111", string mail0 = " ");
    void set_email();
    void change_passwd();
    void print_info();
    static void print_n();
private:
    string name;
    string passwd;
    string mail;
    static int n;
};
int User::n = 0;
User::User(string name0, string passwd0 , string mail0) :name{name0},passwd{passwd0},
mail{ mail0 }{++n; }
void User::set_email() {
    string new_mail;
    cout << "Enter email adress: ";
    cin >> new_mail;
    mail = new_mail;
    cout << "email is set successfully..." << endl;
}
void User::change_passwd() {
    cout << "Enter old password: ";
    string old_passwd, new_passwd;
    int times = 0;
    for (times; times < 3; times++) {
        cin >> old_passwd;
        if (old_passwd == passwd)
        {
            cout << "set new password: " ;
            cin >> new_passwd;
            passwd = new_passwd;
            cout << "new password is set successfully..." << endl;
            break;
        }
        else
            cout << "password input error. ";
        if (times == 2)
        {
            cout << "Please try after a while." << endl;
            break;
            }
        cout << "Please re-enter again: ";
    }
} 
void User::print_info() {
    string s1(passwd.length(), '*');
    cout<<std::left<<setw(10) << "name: " << name << endl;
    cout << std::left << setw(10) <<"passwd: " << s1 << endl;
    cout << std::left << setw(10) <<"email: " << mail << endl;
}
void User::print_n() {
    cout << "there are " << n << " users" << endl;
}

task5.cpp:

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

// 测试User类
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();
}

运行截图：