实验二 类和对象

实验任务1.task1
#include<iostream>
#include<complex>
using namespace std;
int main()
{
    complex<double>c1{ 3,4 }, c2{ 4.5 };
    const complex<double>c3{ c2 };
    cout << "c1=" << c1 << endl;
    cout << "c2=" << c2 << endl;
        cout << "c3=" << c3 << endl;
        cout << "c3.real=" << c3.real() << endl;
        cout << "c3.imag=" << c3.imag() << endl;
        cout << "c1+c2=" << c1 + c2 << endl;
        cout << "c1-c2=" << c1-c2 << endl;
        cout << "abs(c1)=" << abs(c1) << endl;
        cout << boolalpha;
        cout << "c1==c2:" <<( c1==c2) << endl;
        cout<<  "c3==c2:" << (c3==c2) << endl;
        complex<double>c4 = 2;
        cout << "c4=" << c4 << endl;
        c4 += c1;
        cout << "c4=" << c4 << endl;
        return 0;
}

 实验任务2 task2

#include<iostream>
#include<array>
using namespace std;
template<typename T>
void output1(const T& obj) {
    for (auto i : obj)
        std::cout << i << ",";
    std::cout << "\b\b\n";
}
template<typename T>

    void output2(const T & obj) {
        for (auto p=obj.cbegin();p!=obj.cend(); ++p)
            std::cout << *p << ",";
        std::cout << "\b\b\n";
}
int main()
{
    array<int, 5>x1;
    cout<<"x1.size()="<<x1.size()<<endl;
    x1.fill(42);
    x1.at(0) = 999;
        x1.at(4) = -999;
        x1[1] = 777;
        cout << "x1:";
        output1(x1);
        cout << "x1:";
        output2(x1);

        array<double, 10>x2{ 1.5,2.2 };
        cout << "2x.size()" << x2.size() << endl;
        cout << "x2:";
        output1(x2);
        
        array<int, 5>x3{ x1 };
        cout << boolalpha << (x1 == x3) << endl;
        x3.fill(22);
        cout << "x3:";
        output1(x3);

        swap(x1, x3);
        cout << "x1:";
        output1(x1);
        cout << "x3:";
        output1(x3);
        return 0;
}

 

 

实验任务三.

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

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

cout << Employee::doc << endl << endl;

Employee employee1;
employee1.set_info("Sam", 30000, 2015, 1, 6);
employee1.update_hire_date(2017, 6, 30);
employee1.update_salary(35000);
employee1.display_info();
cout << endl << endl;

Employee employee2{"Tony", 20000, 2020, 3, 16};
employee2.raise_salary(15); // 提成15%
employee2.display_info();
cout << endl << endl;

Employee::display_count();
}

int main() {
test();
}

 

 实验四

#include <iostream>
#include<cmath>
#include <math.h>
using namespace std;
class Complex
{
public:
    
    Complex(double  r= 0, double
        i = 0) {
        re = r;
        im = i;
        double abs = sqrt(re * re + im * im);
    }
    Complex(const Complex& x) {
        re = x.re;
        im = x.im;
    }
    
    void add(Complex com) {
        re = re + com.re;
        im = im + com.im;
        cout << re <<   im << "i" << endl;
    }
    void show() {
        if (im != 0)

            cout << re << im << "i" << endl;
        else
            cout << re << endl;
    }
    double get_imag()const {
        return im;
    }
    
    void abs() {
        double b = sqrt(re * re + im * im);
        cout << b << endl;
    }
    friend Complex add(Complex x1, Complex x2) {
        Complex x;
        x.im = x1.im + x2.im;
        x.re = x1.re + x2.re;
        return x;
    }
    friend bool is_equal(const Complex& x1, const Complex& x2);
    friend double abs(Complex& x1);
private:double re, im;
};
bool is_equal(const Complex& x1, const Complex& x2) {
    if (x1.re == x2.re && x1.im == x2.im)
        return true;
    else
        return false;
}
double abs(Complex& x1) {
    return (sqrt(x1.re * x1.re + x1.im * x1.im));
}

 

 实验五：

#include<iostream>
#include<string>
using namespace std;

class User
{
public:
    User(string name, string passwd = "111111", string email = "") :n{ name }, p{ passwd }, e{ email }{count++; }
    ~User() = default;

    void set_email();
    void change_passwd();
    void print_info();
    static void print_n();

private:
    string n, p, e;
    static int count;
};
int User::count = 0;
void User::set_email()
{
    cout << "enter email adress :";
    cin >> e;
    cout << "email is set successfully" << endl;
}
void User::change_passwd()
{
    cout << "enter old password:";
    string pd;
    int i = 3;
    while (i)
    {
        cin >> pd;
        if (pd == p)
        {
            cout << "new passwd is set successfully" << endl;
            break;
        }
        else {
            i--;
            if (i != 0)
                cout << "password error,enter again:";
        }
        if (i == 0)
        {
            cout << "password lock,try later" << endl;
        }
    }
}

void User::print_info()
{
    cout << "name : " << n << endl;
    cout << "passwd: " << "******" << endl;
    cout << "email: " << e << endl;
}
void User::print_n()
{
    cout << "there are" << count << "users." << endl;
}