实验一类与对象

#include<iostream>
#include<math.h>

using namespace std;

class Complex
{
    public:
        Complex();
        Complex(double real1,double imag1);
        Complex(double real1);
        Complex(const Complex &r); 
         
        double get_real() const; 
        double get_imag() const;
        void show() const;
        void add(Complex &a);
         
        friend Complex add(const Complex &c1,const Complex &c2); 
        friend bool is_equal(const Complex &c1,const Complex &c2);  
        friend double abs(const Complex &x1);  
         
    private:
        double real,imag;
};

Complex::Complex():real(0),imag(0)
{
}

Complex::Complex(double real1)
{
       real=real1;
       imag=0;
}

Complex::Complex(double real1,double imag1)
{
    real=real1;
    imag=imag1;
}

Complex::Complex(const Complex &r)
{
    real=r.real;
    imag=r.imag;
}

double Complex::get_real() const
{
    return real;
}

double Complex::get_imag() const
{
    return imag;
}

void Complex::add(Complex &a)
{
    real=real+a.real;
    imag=imag+a.imag;
}

void Complex::show() const
{
    double n1,n2;
    n1=get_real();
    //cout<<n1<<endl;
    n2=get_imag();
    if(n1==0&&n2==0)
    {
        cout<<n1;
    }
    else {
        if(n1==0)
        {
            cout<<n2<<"i";
        }
        else {
            if(n2==0)
            {
                cout<<n1;
            }
            else {
                if(n2>0)
                 cout<<n1<<"+"<<n2<<"i";
                else cout<<n1<<n2<<"i";
                    }
                }
            }
}
 
Complex add(const Complex &c1,const Complex &c2)
{
    Complex c3;
    c3.real=c1.real+c2.real;
    c3.imag=c1.imag+c2.imag;
    return c3;
}

double abs(const Complex &x1)
{
    double x;
     x=sqrt(x1.real*x1.real+x1.imag*x1.imag);
 
    return x;
}
bool is_equal(const Complex &c1,const Complex &c2)
{
    if(c1.real==c2.real&&c1.imag==c2.imag)
    return true;
    else return false;
}

 以上为实验任务三的Complex.hpp源码和运行结果图。

 

实验任务四

//User.hpp

#include<iostream>
#include<string>
using namespace std;
class User
{
    public:
        User(string name1);
        User(string name1,string password1,string email1);
         
        void set_email();   
        void change_passwd();  
        void print_info();    
        static void print_n();
         
    private:
        string name,password,email;
        static int n;  
};


int User::n=0;  


User::User(string name1)
{
    name=name1;
    password="111111";
    email="";
    n++;
}

User::User(string name1,string password1,string email1)
{
    name=name1;
    password=password1;
    email=email1;
    n++;
}


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

void User::change_passwd()
{
    string t0,t1; 
    cout<<"Enter old password:";
    for(int i=1;i<=3;i++)
    {
        cin>>t0;
        if(t0==password)
        {
            cout<<"Enter new password:";
            cin>>t1;
            password=t1;
            break;
        }
        else if(i<=2)
        {
            cout<<"password input error. Please re-enter again:";
        }
        else cout<<"password input error. Please try after a while."<<endl;  
    }
}

void User::print_info()
{
    cout<<"name:"<<name<<endl;
    cout<<"passwd:"<<"******"<<endl;
    cout<<"email:"<<email<<endl;
}
void User::print_n()
{
    if(n==1)
      cout<<"there are "<<n<<" user."<<endl;
    else cout<<"there are "<<n<<" users."<<endl;
}