实验一 类与对象

//#ifndef Complex.hpp
//#define Complex.hpp
#include<iostream>
#include <cmath>
using namespace std;
class Complex{
    private:
      double real;
      double imag;
    public:
      Complex();
      Complex(double r);
      Complex (double r,double l);
      Complex(Complex &p);
      void show() const; 
      void add(const Complex &p);
      double get_real() const{return real;}
      double get_imag() const{return imag;}
      friend Complex add(const Complex &p1,const Complex &p2);
      friend bool is_equal(const Complex &p1,const Complex &p2);
      friend double abs(Complex p);
};
void Complex::show() const
{     
    if(imag>0)
    cout<<real<<"+"<<imag<<"i";
    else if(imag==0)
    cout<<real;
    else
    cout<<real<<imag<<"i";
}
Complex::Complex()
{
    real=0;
    imag=0;
}

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

Complex::Complex(double r,double i)
{
    real=r;
    imag=i;
}

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

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

Complex add(const Complex &p1,const Complex &p2){
    Complex p;
    p.imag = p1.imag + p2.imag;
    p.real = p1.real + p2.real;
    return p;
}

bool is_equal(const Complex &p1,const Complex &p2)
{
    if ((p1.real==p2.real)&&(p1.imag==p2.imag)) return true;
            else return false;
}

double abs(Complex p){
    return sqrt(p.real*p.real+(p.imag*p.imag));
}

//#endif

#include "Complex.hpp"
#include <iostream>
int main()
{
    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;
    c4 = add(c1, c2);
    cout << "c4 = c1 + c2 = ";
    c4.show();
    cout << endl;

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

 

 

 

 

 

 

 

 

 

 

//#ifndef User.h
//#define User.h
#include<iostream>
#include<string>
using namespace std;
class User 
{
    private:
        string name,password,email;
        static int n;
    public:
        User(string x) {name=x; password="111111"; email='\0'; n++;}
        User(string x,string y,string z) {name=x; password=y; email=z; n++;}
        void set_email();
        void change_passwd();
        void print_info();
        static void print_n();
};
int User::n=0;
void User::print_n() {
    cout<<"there are "<<n<<"users";
}

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

void User::change_passwd()
{
    cout<<"Enter old password: ";
    string A,B;
    for(int i=1;i<=3;i++)
    { 
         cin>>A;
         if(A==password)
         {
             cout<<"Enter new password: ";
             cin>>B;
             cout<<"new password is set successfully..."<<endl;
         }
         else if(i<=2&&A!=password)
         {
             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;
}
//#endif

#include "User.h"
#include <iostream>

int main()
{
    using namespace std;

    cout << "testing 1......" << endl;
    User user1("Polaris", "010314", "sct@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();
}