实验2 类和对象

实验任务3

complex.hpp

# 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;
};
~Complex(){};

double get_real() const {return real;};
double get_imag() const {return imag;};

void add(const Complex &c);
void show() const;

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);

private:
double real;
double imag;

};


void Complex::add(const Complex &c){
real += c.real;
imag += c.imag;
}
void Complex::show() const {
if (real == 0 && imag == 0) { std::cout << 0; }
else if (real == 0) { std::cout << imag << "i"; }
if(imag>0)
{std::cout << real << " + " << imag << "i"; }
else if(imag<0)
{std::cout << real << "-"<< -imag << "i"; }
else if(imag ==0)
{std::cout << real ; }
}
Complex add(const Complex &c1 , const Complex &c2){
double resultreal = c1.real + c2.real;
double resultimag = c1.imag + c2.imag;
return Complex (resultreal,resultimag);
}
bool is_equal(const Complex &c1 , const Complex &c2){
return (c1.real == c2.real)&&(c1.imag == c2.imag);
}
double abs(const Complex &c){
double x = sqrt(c.real*c.real + c.imag*c.imag);
return x;
}

#include"complex.hpp"


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();
}

 

 

实验任务4

#pragma once  
#include <iostream>  
#include <string>  
using namespace std;  
  
class User{  
public:  
    User(std::string name, std::string passwd = "111111", std::string email = " "):name{name}, passwd{passwd}, email{email} {n++;}  
    void set_email();  
    void change_passwd();  
    void print_info();  
    static void print_n();  
  
private:  
    string name;  
    string passwd;  
    string email;  
    static int 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 p, a;  
    cout << "Enter old password: ";  
    cin >> p;  
    int i = 0;  
    while (p != passwd){  
        i++;  
        cout << "password input error. Please re-enter again: ";  
        cin >> p;  
        if (i>=2){  
            cout << "password input error. Please try after a while" << endl;  
            break;  
        }  
    }  
    if (p == passwd){  
        cout << "Enter new passwd: ";  
        cin >> a;  
        passwd = a;  // Add this line to update the password.  
        cout << "new passwd is set successfully..." << endl;  
    } else {  
        cout << "The entered old password is incorrect." << endl;  
    }    
}  
void User::print_info(){  
    string s(passwd.size(), '*'); // This line is not necessary. You can remove it.   
    // It seems like you are trying to mask the password with '*'. However, the variable 's' is not used anywhere.   
    // You should directly use 'passwd' instead of 's'.   
    cout << "name: " << name << endl;  
    cout << "passwd: " << passwd << endl; // Use 'passwd' instead of 's'.   
    cout << "email: " << email << endl;   
}   
void User::print_n(){   
    cout << "there are " << n << "users" << endl;   
}

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

//测试IUser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();
}

 

 

实验任务5

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

#include "account.h"
#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 date) {
    double interest = accumulate(date) * rate/365;
    if(interest != 0)
      record(date, interest);
    accumulation = 0;
}
void SavingsAccount::show() const {
    cout << "#" << id << "\tBalance: " << balance;
}

#include "account.h"
#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;
}