实验二 类与对象

实验任务3

complex.hpp

#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, new_passwd;  
    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 password: ";  
        cin >> new_passwd;  
        cout << "new password is set successfully..." << endl;  
        passwd = new_passwd;  
    } else {  
        cout << "The entered old password is incorrect." << endl;  
    }  
}  
void User::print_info(){  
    cout << "name: " << name << endl;  
    cout << "passwd: " << passwd << endl;  // Print password without masking. For example, if the password is 12345, it will be displayed as 12345.   
    cout << "email: " << email << endl;  
}  
void User::print_n(){  
    cout << "there are " << n << "users" << endl;  
}

main.cpp

#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.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;
}
int main(){
    test();
}

 

实验任务4

uesr.hpp

#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;   
}

task4.cpp

#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

account.hpp

class SavingsAccount {  
public:  
    // ... 其他函数 ...  
  
    // 构造函数  
    SavingsAccount(int date, int id, double rate) {  
        this->id = id;  
        this->balance = 0.0;  
        this->rate = rate;  
        this->lastDate = date;  
        this->accumulation = 0.0;  
    }  
  
    // 记录一笔账  
    void record(int date, double amount) {  
        lastDate = date;  
        balance += amount;  
        accumulation += amount;  
        total += amount;  // 更新total here  
    }  
  
    // 存入现金  
    void deposit(int date, double amount) {  
        if (amount > 0) {  
            record(date, amount);  
            std::cout << "Deposited: " << amount << " on " << date << std::endl;  
            total += amount;  // 更新total here  
        }  
    }  
  
    // 取出现金  
    void withdraw(int date, double amount) {  
        if (amount > 0 && amount <= balance) {  
            record(date, -amount);  
            std::cout << "Withdrew: " << amount << " on " << date << std::endl;  
            total -= amount;  // 更新total here  
        } else {  
            std::cout << "Insufficient funds!" << std::endl;  
        }  
    }  
  
    // 结算利息  
    void settle(int date) {  
        double interest = balance * rate / 365 * (date - lastDate); // assuming simple interest here  
        balance += interest;  
        accumulation += interest;  
        total += interest;  // 更新total here  
        lastDate = date; // update the lastDate to current date after settlement  
    }  
  
    // 显示账户信息  
    void show() const {  
        std::cout << "Account ID: " << id << std::endl;  
        std::cout << "Balance: " << balance << std::endl;  
        std::cout << "Rate: " << rate << std::endl;  
        std::cout << "Last Date: " << lastDate << std::endl;  
        std::cout << "Accumulation: " << accumulation << std::endl;  
        std::cout << "Total: " << total << std::endl;  // Add total to the output here  
    }  
    
private:    
    double total; // Declare total here    
    // ... 其他变量 ...    
};

account.cpp

#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;  //保留小数点后两位
    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 > getBlance())
        cout << "Error: not enough money" << endl;
    else
        record(date, -amount);
}
void SavingsAccount::settle(int date){
    double interest = accumulate(date) * rate/365;  //计算年息
    if (interest != 0)
        record(date, interest);
    accumulation = 0;
}
void SavingsAccount::show() const {
    cout << "#" << id << "\tBlance:" << balance;
}