实验1 类与对象

#include <iostream>
#include<cmath>
using namespace std;
class complex{
    public:
        complex(double real=0, double imag=0):REAL{real},IMAG{imag}{}
        complex(const complex &obj):REAL{obj.REAL},IMAG{obj.IMAG}{}
        ~complex()=default;
        double get_real()const;
        double get_imag()const;
        double show()const;
        complex add(const complex &c);
        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;    
};
double complex::get_real()const
{
    return REAL;
}
double complex::get_imag()const
{
    return IMAG;
}
double complex::show()const
{
    if(IMAG>0)
    {
        cout<<REAL<<" + "<<IMAG<<"i";
     } 
     
    else{
        if(IMAG==0){
            cout<<REAL;
        } 
        else
    
        {
            cout<<REAL<<" - "<<IMAG*(-1)<<"i";
        }
    }
    
}
complex complex::add(const complex &c)
{
    REAL+=c.REAL;
    IMAG+=c.IMAG;
    return c;
     
}
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>
#include<cmath>
using namespace std;


int main()
{
     complex c1(1,2);
    const complex c2(3.5);
    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;
}

 

 

 

#include<iostream>
#include<string>
#include<conio.h>
#include<cstring>

using namespace std;

class user{
public:
           user(string NAME,string PASSWD="111111",string EMAIL=" "):name{NAME},passwd{PASSWD},email{EMAIL}{count++;}
           user(const user &obj):name{obj.name},passwd{obj.passwd},email{obj.email}{count++;}
           ~user(){count--;}
           void set_email();  //一开始没有注意到是void类型，导致了程序错误
           void  print_Info();
          void changepasswd ();
          static void print_n(){
            cout<<"there are "<<count<<" users.";
}
    private:
        
        static int count;
        string name;
        string passwd;
        string email;
};
int user::count=0;     //初始化极为重要
void user::changepasswd(){
    string oldpasswd;
    int chance=0;
    cout<< "Enter old password: ";

    while(oldpasswd!=passwd){
        cin>>oldpasswd;
        if(oldpasswd==passwd)
        {
            chance=2;
            break;
        }
        
        
        
      chance++;
    
        if(chance==3)
        break;    
        else{            
            cout <<"password input error. Please re-enter again:";
                          }
       
      
        
    }
    if(chance==3)
    
    {
        cout << "password input error. Please try after a while"<< endl;
    }
    else{
    
            cout << "Enter new password: ";
              cin>>passwd;
        
            cout<<"new passwd is set sucessfully..."<<endl;
        
    }
}

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

void user::print_Info(){
    cout << "name: " << name<<endl;
    cout << "passwd: " << "******"<<endl ;
    cout << "email: " << email<<endl;
}

 task4测试数据

#include "User.hpp"
#include <iostream>
int main()
{
    using namespace std;

    cout << "testing 1......" << endl;
    user user1("Jonny", "92197", "xyz@hotmail.com");
    user1.print_Info();

    cout << endl
         << "testing 2......" << endl
         << endl;
    user user2("Leonard");
    user2.changepasswd();
    user2.set_email();    
    user2.print_Info();
    user::print_n();
}