实验二 类与对象

 

Task 3:

Complex.cpp:

#include <iostream>
#include <cmath>

class Complex{
    public:
        Complex (double r=0,double i=0){
            real = r;
            imag = i;
        }
        Complex (const Complex &c){
            real = c.real;
            imag = c.imag;
        }      
            
    private:
        double real;
        double imag;
        
    public:
        double get_real() const {return real;}
        double get_imag() const {return imag;}
        void show() const {
            std::cout << real;
            if(imag > 0)
            std::cout << "+" << imag << "i";
            if(imag < 0)
            std::cout << "-" << imag << "i";
        }
        void add(const Complex &c1){
            real += c1.get_real();
            imag += c1.get_imag();
        }
        
    public:
        friend Complex add(const Complex &c1,const Complex &c2){
            return Complex(c1.get_real()+c2.get_real(),c1.get_imag()+c2.get_imag());
        };
        friend bool is_equal(const Complex &c1,const Complex &c2){
            return (c1.real == c2.real) && (c1.imag == c2.imag);

        }
        friend double abs(const Complex &c1){
            return sqrt(c1.real*c1.real + c1.imag*c1.imag);
        }

};

main.cpp:

#include <iostream>
#include <cmath>
#include "Complex.cpp"







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();
}

 Task 4:

User.hpp:

#pragma once
#include <iostream>
#include <string>

using std::string; 
using std::cout;
using std::cin;
class User{
public:    
    User();
    User(string name,string passwd="111111",string email=""):name{name},passwd{passwd},email{email}
    {n++;};
    void print_info();
    void set_email();
    void change_passwd();
    static void print_n();

private:
    string name;
    string passwd;
    string email;
    static int n;

};
int User::n=0;

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


void User::change_passwd(){
    using namespace std;
    string pwd,newwd;
    for(int i=0;i<=3;i++)
    {
    
        if(i==0){
        
            cout<<"Enter old password:";
        }
        else if(i==3){
        
            cout << "Please try after a while. \n";
            break;
        }
        
        else {
            cout<<"Please re-enter again:";
            cin>>pwd;
            if  (pwd!=passwd){
            
                cout<<"password input error.\n";
                continue;
            }
            else{
            
                cout<<"Enter newpassword:";
                cin>>newwd;
                passwd=newwd;
                cout << "new passwd is set successfully...\n";
                break;
            }
        }
    }    
}

void User::print_info(){
    using namespace std;

string s(passwd.size(), '*');

cout << "passwd: " << passwd << endl; cout << "name: " << name << endl; cout << "email: " << email << endl; }

void User::print_n(){
cout << "there are " << n << " users\n";


}

main.cpp:

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

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(); 
}

 

 Task 5：

account.hpp:

#ifndef__ACCOUNT_H__
#define__ACCOUNT_H__

class SavingsAccount
{
private:
    int id;
    double balance;
    double rate;
    int lastDate;
    double accumulation;
    static double total;
    void record(int data,double amount);
    double accumulate(int date)const
    {
        return accumulation+balance*(date-lastDate);
    }
public:
    SavingsAccount(int data,int id,double rate);
    int getId()const{return id;}
    double getBalance()const{return balance;}
    double getRate()const{return rate;}
    static double getTotal(){return total;}
    void deposit(int date,double amount);
    void withdraw(int data,double amount);
    void settle(int date);
    void show() const;
};

account.cpp:

#include"accout.hpp"
#include<cmath>
#include<iostream>
using namespace std;
double SavingsAccount::total=0;
SavingsAccount::SavingsAccount(int date,int id,double rate):id(id),balance(0),rate(rate),lastDate(date),accumulation(0)
{
    cout<<date<<"\t#"<<id<<"is created"<<endl;
}
void SavingsAccount::record(int date,double amount)
{
    accumulation=accumulate(date);
    lastDate=date;
    amount=floor(amount*100+0.5)/100;
    balance+=amount;
    total+=amount;
    cout<<date<<"\t#"<<id<<"\t"<<amount<<"\t"<<balance<<endl;
}
void SavingsAccount::deposit(int date,double amount)
{
    record(date,amount);
}
void SavingsAccount::withdraw(int date,double amount)
{
    if(amount>getBalance())
        cout<<"Error:not enough money"<<endl;
    else
        record(date,-amount);
}
void SavingsAccount::settle(int data)
{
    double interest=accumulate(data)*rate/365;
    if(interest!=0)
        record(data,interest);
    accumulation=0;
}
void SavingsAccount::show() const
{
    cout<<"#"<<id<<"\tBalance:"<<balance;
}

5_11.cpp:

#include "accout.hpp"
#include <iostream>
using namespace std;
int main() {

    SavingsAccount sa0(1, 21325302, 0.015);
    SavingsAccount sa1(1, 58320212, 0.015);
 
    sa0.deposit(5, 5000) ;
    sa1.deposit(25, 10000);
    sa0.deposit(45, 5500);
    sa1.withdraw(60, 4000);

    sa0.settle(90);
    sa1.settle(90);
 
    sa0.show();cout << endl;
    sa1.show();cout << endl;
    cout << "Total:" << SavingsAccount::getTotal() << endl;
    return 0;
}