实验1 类与对象

实验任务3

Complex.hpp

#ifndef COMPLEX_HPP
#define COMPLEX_HPP
#include<iostream>
#include<cmath>
using namespace std;
class Complex
{
public:
    Complex();
    Complex(double re);
    Complex(double re,double im);
    Complex(const Complex &C);
    double get_real() const{return real;}
    double get_imag() const{return imag;}
    void show() const;
    void add(const Complex &x);
    friend Complex add(const Complex &c1,const Complex &c2);
    friend bool is_equal(Complex c1,Complex c2);
    friend double abs(Complex c);
private:
    double real;
    double imag;
 };
Complex::Complex():real(0),imag(0){}
Complex::Complex(double re):real(re),imag(0){}
Complex::Complex(double re,double im):real(re),imag(im){}
Complex::Complex(const Complex &c)
{
    real=c.real;
    imag=c.imag;
}
void Complex::show() const
{
        if(imag>=0)
        cout<<real<<"+"<<imag<<"i"<<endl;
        if(imag<0)
        cout<<real<<imag<<"i"<<endl;
}
void Complex::add(const Complex &x)
{
    real+=x.real;
    imag+=x.imag;
}
Complex add(const Complex &c1,const 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.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);
}
#endif

task3.cpp

#include "Complex.hpp"
#include <iostream>
int main()
{
using namespace std;
Complex c1(6, -7);
const Complex c2(2.5);
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;
}

 

测试结果截图

 

实验任务4 

User.hpp

#ifndef USER_HPP
#define USER_HPP
#include<iostream>
#include<string>
using namespace std;
class User
{
public:
    User(string name0);
    User(string name0,string passwd0,string email0);
    User(User &u);
    void set_email();
    void change_passwd() ;
    void print_info() ;
    static void print_n();
private:
    string name;
    string passwd;
    string email;
    static int count;
};
int User::count=0;
User::User(string name0):name(name0),passwd("111111"),email(""){++count;}
User::User(string name0,string passwd0,string email0):name(name0),passwd(passwd0),email(email0)
{
    ++count;
}
User::User(User &u):name(u.name),passwd(u.passwd),email(u.email)
{
    ++count;
}
void User::set_email()
{
    string email0;
    cout<<"Enter email address:";
    cin>>email0;
    email=email0;
    cout<<"email is set successfully..."<<endl;
}
void User::change_passwd()
{
    string pass;
    int i=1;
    cout<<"Enter old password:";
    cin>>pass;
    while(pass!=passwd&&i<3)
    {
        cout<<"password input error.Please re-enter again:";
        cin>>pass;
        i++;
    }
    if(pass!=passwd&&i==3)
    {
        cout<<"password input error.Please try after a while."<<endl;
    }
    if(pass==passwd)
    {
        cout<<"Enter new passwd:";
        cin>>pass;
        cout<<"new passwd is set successfully..."<<endl;
    }
}
void User::print_info()
{
    cout<<"name:"<<name<<endl;
    cout<<"passwd:******"<<endl;
    cout<<"email:"<<email<<endl;
}
void User::print_n()
{
    cout<<"there are "<<count<<"users."<<endl;
}
#endif

 

task4.cpp

#include "User.hpp"
#include <iostream>
int main()
{
using namespace std;
cout << "testing 1......" << endl;
User user1("Jonny", "111222", "xyz@hotmail.com");
user1.print_info();
cout << endl
<< "testing 2......" << endl
<< endl;
User user2("Leonard");
user2.change_passwd();
user2.set_email();
user2.print_info();
User::print_n();
}

 

测试结果截图