实验2 类和对象(2）

实验任务4

#pragma once
#include<iostream>
#include<cmath>
using namespace std;
//定义Complex类
class Complex{
    public:
        Complex(double r=0,double i=0):real{r},imag{i}{}
        Complex(const Complex &c)
        {
            real=c.real;
            imag=c.imag;
        }
        double get_real()const{return real;}
        double get_imag()const{return imag;}
        void show()const
        {
            if(imag>0)
            {
                cout<<real<<'+'<<imag<<'i';
            }
            else if(imag<0)
            {
                cout<<real<<imag<<'i';
            }
            else
            {
                cout<<real;
            }
        }
        void add(const Complex c)
        {
            real+=c.real;
            imag+=c.imag;
        }
        friend Complex add(const Complex c1,const Complex c2);
        friend bool is_equal(const Complex c1, const Complex c2);
        friend double abs(const Complex c1);
    private:
        double real,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(const Complex c1,const Complex c2)
{
    if(c1.real==c2.real&&c1.imag==c2.imag)
    {
        return true;
    }
    return false;
}
double abs(const Complex c)
{
    return sqrt(c.real*c.real+c.imag*c.imag);
}

#include "Complex.hpp"
#include <iostream>
// 类测试
void test() {
using namespace std;
Complex c1(-3, -4);
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;
}
int main() {
test();
}

实验任务5

#pragma once
#include<iostream>
#include<iomanip>
#include<string>
using namespace std;
class User{
public: 
    User(string s1,string s2="111111",string s3=""):name{s1},passwd{s2},email{s3}{n++;}
    ~User(){n--;}
    void change_passwd()
    {
        string s;
        cout<<"Enter old password: ";
        cin>>s;
        if(s==passwd)
        {
            cout<<"Enter new passwd: ";
            cin>>passwd;
            cout<<"new passwd is set successfully..."<<endl;
        }
        else
        {
            cout<<"password input error. Please re-enter again: ";
            cin>>s;
            if(s==passwd)
            {
                cout<<"Enter new passwd: ";
                cin>>passwd;
                cout<<"new passwd is set successfully..."<<endl;
            }
            else
            {
                cout<<"password input error. Please re-enter again: ";
                cin>>s;
                if(s==passwd)
                {
                    cout<<"Enter new passwd: ";
                    cin>>passwd;
                    cout<<"new passwd is set successfully..."<<endl;
                }
                else
                {
                    cout<<"password input error. Please try after a while."<<endl;
                }
            }
        }
    }
    void set_email()
    {
        cout<<"Enter email address: ";
        cin>>email;
        cout<<"email is set successfully..."<<endl;
    }
    void print_info()
    {
        cout<<left<<setw(8)<<"name:"<<name<<endl;
        cout<<left<<setw(8)<<"passwd:";
        for(auto i:passwd)
        {
            cout<<'*';
        }
        cout<<endl;
        cout<<left<<setw(8)<<"email:"<<email<<endl;
    }
private:
    string name,passwd,email;
private:
    static int n;
};

#include "User.hpp"
#include <iostream>
// 测试User类
void test() {
using std::cout;
using std::endl;
cout << "testing 1......\n";
User user1("Mary", "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 User::n=0;
int main() {
test();
}