实验2 类和对象(2)

• 4. 实验任务4 不使用C++标准库，自行设计并实现一个简化版复数类Complex

Complex.hpp

#include<iostream>
#include<cmath>
using namespace std;
class Complex{
	public:
	  Complex(double a=0,double b=0):real{a},imag{b}{}
	  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;
	  void add(const Complex& c);
	  friend Complex add(const Complex& c1,const Complex& c2);
	  friend bool is_equal(const Complex& c1,const Complex& c2);
	  friend double abs(const Complex& c);
	private:
		double real,imag;
}; 
void Complex::show()const{
   if(imag==0)
	cout<<real;
   if(imag>0)
	cout<<real<<"+"<<imag<<"i";
   if(imag<0)
	cout<<real<<imag<<"i";
}
void Complex::add(const Complex& c)
{
		real+=c.real;
		imag+=c.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;
	else
	return false;
}
double abs(const Complex& c)
{
	return sqrt(c.real*c.real+c.imag*c.imag);
}

main.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();
}

 

•  5.实验任务5

User.hpp

#pragma once
#include<iostream>
#include<string>
using namespace std;
class User
{
    public:
    User(string n1,string p1="111111",string e1="");
    void set_email();
    void change_passwd();
    void print_info() ;
    static void print_n(){cout<<"there are "<<User::n<<" users.";}
    private:
        string name,passwd,email;
        static int n;
};
User::User(string n1,string p1,string e1):name{n1},passwd{p1},email{e1}
{++n;}
int User::n=0;
void User::set_email()
{
    cout<<"Enter email address: ";
    string s;
    cin>>s;
    email=s;
    cout<<"email is set successfully..."<<endl;
}
void User::change_passwd()
{
    string c1;
    cout<<"Enter old password: ";
    cin>>c1;
    int count=1;
    while(c1!=passwd&&count<3)
    {
        cout<<"password input error. Please re-enter again: ";
        cin>>c1;
        count++;
        if(count==3)
        cout<<"password input error. Please try after a while."<<endl;
    }
    if(count!=3)
    {
        cout<<"Enter new passwd: ";
        cin>>c1;
        passwd=c1;
        cout<<"new passwd is set successfully..."<<endl;
    }
}
void User::print_info() {
    cout<<"name: "<<name<<endl;
    cout<<"passwd: ";
    for(int i=0;i<passwd.length();i++)
    cout<<"*";
    cout<<endl;
    cout<<"email: "<<email<<endl;
}

main.cpp

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