实验二

task4:

complex.hpp:

#pragma once
#include<iostream>
#include<cmath>
using std::cout;
using std::endl;
class complex{
    public:
        complex(double r=0.0,double i=0.0):real(r),imag(i){}
        complex(complex& c) :real(c.real), imag(c.imag){}void add(const complex &c){ real+=c.real; imag+=c.imag;}
        void show()const;
        
        double get_real() const { return real; }
        double get_imag() const { return imag; }
        
        friend double abs(const complex &c);
        friend complex add(const complex &c1,const complex &c2);
        friend bool is_equal(const complex &c1,const complex &c2);
    private:
        double real,imag;
};    
    

    void complex::show()const{
        if(imag!=0)
        cout << real << "+" << imag << "i" << endl;
        else
        cout << real << imag << "i" << endl;
    }
    double abs(const complex &c){
        double m;
        m=sqrt(c.real*c.real+c.imag*c.imag);
        return m;
    }
    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;
        else
        return false;
    }




 

task.cpp:

#include "complex.hpp"
#include <iostream>

void test() {
    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;
}

int main() {
    test();
}

 

task5:

users:

#pragma once
#include<iostream>
#include<cstring>
#include<string>
using namespace std;
class user {
    public:
        user(string name0,string passwd0="111111",string email0=""); 
        void set_email();
        void change_passwd();
        void print_info() const;
        void static print_n() {cout << "there are " << n << " users" << endl;}
    private:
        string name;
        string passwd;
        string email;
        static int n;
};
user::user(string name0,string passwd0,string email0):name(name0),passwd(passwd0),email(email0){n++;}
int user::n=0;
void user::set_email(){
    cout << "Enter email address:";
    cin >> email;
    cout << "email is set successfully..." << endl;
    }
void user::change_passwd(){
    string oldpasswd = passwd;
    int count;
    cout << "Enter old password:";
    cin >> passwd;
    count = 1;
    while(oldpasswd!=passwd&&count<3){
        cout << "password input error. please re-enter again:";
        cin >> passwd;
        count++;
        if(oldpasswd!=passwd&&count == 3){
            cout << "password input error. please try after a while." << endl;
        }
    }
    if(oldpasswd == passwd){
       cout << "Enter new passwd:";
       cin >> passwd;
       cout << "new passwd is set successfully..." << endl; 
    }
    if(oldpasswd!=passwd&&count == 3)
    passwd = oldpasswd;
}
void user::print_info() const{
     int k;
     cout << "name: " << name << endl;
     cout << "passwd: ";
     k = passwd.size();
     while(k--)
     cout << "*";
     cout << endl;
     cout << "email: " << email << endl;
}

    

task5.cpp:

#include "user.hpp"
#include <iostream>

void test() {
    using std::cout;
    using std::endl;

    cout << "testing 1......\n";
    user user1("Hansem", "1269854", "qwer@hhhmail.com");
    user1.print_info();

    cout << endl
         << "testing 2......\n\n";
         
    user user2("David");
    user2.change_passwd();
    user2.set_email();
    user2.print_info();

    cout << endl;
    user::print_n();
}

int main() {
    test();
}