# 实验二 类与对象（二）

Complex.hpp:

#pragma once
#include<iostream>
#include"math.h"
using namespace std;

class Complex{
public:
Complex(double r = 0.0,double i = 0.0):real{r},imag{i} {}
Complex(const Complex &c):real{c.real},imag{c.imag} {}
~Complex()=default;

double get_real() const {return real;}
double get_imag() const {return imag;}
void show() const;

friend Complex add(const Complex &c1,const Complex &c2);
friend bool is_equal(const Complex &c1,const Complex &c2);
friend double abs(Complex &c);
private:
double real,imag;
};
void Complex::show() const{
if(real==0 && imag==0 )
cout << 0;
else if(real!=0 && imag==0)
cout << real;
else if(real==0 && imag!=0)
cout << imag << "i";
else if(real!=0 && imag>0)
cout << real << "+" << imag << "i";
else
cout << real << imag << "i";
}

real+=c.real; imag+=c.imag;
}

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

bool is_equal(const Complex &c1,const Complex &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);
}

#include "Complex.hpp"
#include <iostream>
void test() {
using namespace std;

Complex c1(3, -4);
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;
cout << "c4 = c1 + c2 = ";
c4.show();
cout << endl;

cout << "c1 += c2, " << "c1 = ";
c1.show();
cout << endl;
}

int main() {
test();
}

User.hpp

#pragma once
#include<iostream>
#include<string>
#include<cstring>
using namespace std;

class User{
public:
User(string na,string p="111111",string e=""):name{na},passwd{p},email{e} {n++;}
void set_email();
void change_passwd();
void print_info() const;
void static print_n() {cout << "there are " << n << " users" << endl;}
private:
string name,passwd,email;
static int n;
};

int User::n=0;

void User::set_email()
{
cout << "Enter email address: ";
cin >> email;
cout << "email is set successfully..." << endl;;
}

void User::change_passwd()
{
int i;
string old_passwd=passwd;
cout << "Enter old password: ";
for(i = 1;i <= 3;i++)
{
cin >> passwd;
if(passwd==old_passwd)
{
cout << "Enter new passwd: ";
cin >> passwd;
cout << "new passwd is set successfully..." << endl;
break;
}
else if(passwd!=old_passwd && i<3)
else
}
}

void User::print_info() const
{
string s2(passwd.length(), '*');
cout << "name:   " << name << endl;
cout << "passwd: " << s2 << endl;
cout << "email:  " << email << endl;
}

#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();
}

test1：

test2：

posted @ 2022-10-18 16:42  lovessr  阅读(8)  评论(0编辑  收藏  举报