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# 实验二

### hpp文件如下

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

Complex::Complex(const Complex& c1)
{
real = c1.real;
imag = c1.imag;
}
void Complex::show() const
{
if (imag == 0)
cout << real;
else if (imag < 0)
cout << real << " - " << abs(imag) << "i";
else
cout << real << " + " << imag << "i";
}
{
real += c1.real;
imag += c1.imag;
}
Complex add(Complex const& c1, Complex const& 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;
return false;
}
double abs(Complex const& c1)
{
return sqrt(c1.real * c1.real + c1.imag * c1.imag);
}
``````

### cpp文件如下：

``````#include <Complex>
#include <iostream>
// 类测试
void test() {
using namespace std;
Complex c1(3, -4);
const Complex c2(7.8);
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;
cout << "c4 = c1 + c2 = ";
c4.show();
cout << endl;
cout << "c1 += c2, " << "c1 = ";
c1.show();
cout << endl;
}
int main() {
test();
}
``````

### hpp文件如下：

``````#pragma once
#include<iostream>;
#include<string>
class User {
public:
User(std::string name0, std::string password0 = "111111",std::string email0 = "");
void set_email();
void change_passwd();
void print_info();
void static print_n() {
std::cout << "共有 " << n << " 名用户" << std::endl;
}
private:
std::string name;
std::string email;
std::string passwd;
static int n;

};
int	User::n = 0;
User::User(std::string name0,  std::string password0,std::string email0) :name{ name0 }, email{ email0 }, passwd{ password0 } { n++; }
void User::set_email() {
std::string email1;
std::cout << "请用户用键盘输入邮箱地址！" << std::endl;
std::cin >> email1;
if (email1 != "")
{
email = email1;
std::cout << "邮箱设置成功！" << std::endl;
}
else
std::cout << "未设置邮箱，将使用默认值！" << std::endl;

}
void User::change_passwd() {
std::cout << "请输入旧密码！" << std::endl;
for (int i = 0; i < 3; i++)
{
flag:
{
std::cout << "原密码不正确,请重新输入！";
std::cout << "已连续输入错误" << i + 1 << "次！"<<std::endl;
if (i == 2)
{
std::cout << "已连续输入三次错误密码，请稍后再试。"<<std::endl;
goto flag;
}

}
{
std::cout << "原密码验证成功，请输入新密码！"<<std::endl;
std::cin >> passwd;
std::cout << "密码修改成功！" << std::endl;
break;
}
}

}
void User::print_info() {
int length = passwd.length();
std::cout << "用户名为：" << name << std::endl;
std::cout << "邮箱为：" << email << std::endl;
std::cout << "密码为：";
while (length--)
{
std::cout << "*";
if (length == 0)
std::cout << std::endl;
}
}
``````

### cpp文件如下：

``````#include "User.hpp"
#include <iostream>
// 测试User类
void test() {
using std::cout;
using std::endl;
cout << "testing 1......n";
User user1("Li", "123456", "lkx@hotmail.com");
user1.print_info();
cout << endl
<< "testing 2......nn";
User user2("lixuan");
user2.change_passwd();
user2.set_email();
user2.print_info();
cout << endl;
User::print_n();
}
int main() {
test();
}
``````