实验2

实验任务4:

Complex.hpp:

#pragma once
#include<iostream>
#include<string>
#include<iomanip>
#include<math.h>

using namespace std;

class Complex
{
    public:
        Complex();
        Complex(double x);
        Complex(double x,double y);
        Complex(const Complex&c);
        double get_real () const {return shibu;}
        double get_imag()const {return xubu;}
        void show() const;
        void add(const Complex&c);
    private:
        double shibu,xubu;
        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);
};

Complex::Complex():shibu{0},xubu{0}{}

Complex::Complex(double x):shibu{x},xubu{0}{}

Complex::Complex(double x,double y):shibu{x},xubu{y}{}

Complex::Complex(const Complex&c):shibu{c.shibu},xubu{c.xubu}{}

void Complex::show() const
{
    if(xubu>0)
    cout<<shibu<<" + "<<xubu<<"i";
    else if(xubu<0)
    cout<<shibu<<" "<<xubu<<"i";
    else 
    cout<<shibu;
}

void Complex::add(const Complex&c)
{
    shibu+=c.shibu;
    xubu+=c.xubu;
}

Complex add(const Complex&c1, const Complex&c2)
{
    Complex c;
    c.shibu=c1.shibu+c2.shibu;
    c.xubu=c1.xubu+c2.xubu;
    return c;
}

bool is_equal(const Complex&c1, const Complex&c2)
{
    return c1.shibu==c2.shibu&&c1.xubu==c2.xubu;
}

double abs(const Complex&c1)
{
    return sqrt(c1.shibu*c1.shibu+c1.xubu*c1.xubu);
}

test4:

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

void test() {
    using namespace std;

    Complex c1(5, -3);
    const Complex c2(2.3);
    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();
}

运行截图：

实验任务5：

User.hpp:

#include<iostream>
#pragma once
#include<cstring>
#include<string.h>

using namespace std;

class User
{
    public:
        
        User(string x,string y="111111",string z=""): name{x}, passwd{y}, email{z} {count++;}
        void set_email();
        void change_passwd();
        void print_info();
        void static print_n()
        {
        cout<<endl<<"there are "<<count<<" users"<<endl;
        }
    private:
        string name; string passwd; string email;
        static int count;
};

int User::count=0;

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

void User::change_passwd()
{
    int k=1;
    string a;
    cout<<"Enter old password: ";
    while(cin>>a)
    {
        if(k==3)
        {
            cout<<"password input error, Please try after a while"<<endl; 
            break;
        }
        if(a!=passwd)
        {
            k++;
            cout<<"password input error, Please re-enter again: ";
            continue;
        }
        if(a==passwd)
        {
            cout<<"Enter new password: ";
            cin>>passwd;
            cout<<"new password is set successfully..."<<endl;
            break;
        }
    }
}

void User::print_info()
{
    cout<<"Name:   "<<name<<endl;
    string k=passwd;
    cout<<"Passwd: ";
    string password(passwd.length(),'*');
    cout<<"password: "<<password<<endl;
    cout << endl;
    cout << "email: " << email << endl;
}

test5:

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

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

    cout << "testing 1......\n";
    User user1("Jonny", "92197", "[email protected]");
    user1.print_info();

    cout << endl
         << "testing 2......\n\n";
         
    User user2("RNGXiaohu","2200");
    user2.change_passwd();
    user2.set_email();
    user2.print_info();

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

int main() {
    test();
}

初始运行截图：

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