实验二

任务1

方式1

#ifndef T_H 
#define T_H 
#include <iostream> 
#include <string> 
using namespace std; 
class T { 
public: 
T(int x = 0, int y = 0);  
T(const T &t); 
T(T &&t); 
~T(); 
void set_m1(int x); 
int get_m1() const; 
int get_m2() const; 
void display() const;
friend void func(); 
private: 
int m1, m2; 
public: 
static void disply_count();
public: 
static const string doc; 
static const int max_count;
private: 
static int count; 
};
void func(); 
#endif

#include "t.h"  
const string T::doc{"a simple class"}; 
const int T::max_count = 99; 
int T::count = 0; 
T::T(int x, int y): m1{x}, m2{y} { 
++count; 
cout << "constructor called.\n"; 
}
T::T(const T &t): m1{t.m1}, m2{t.m2} { 
++count; 
cout << "copy constructor called.\n"; 
}
T::T(T &&t): m1{t.m1}, m2{t.m2} { 
++count; 
cout << "move constructor called.\n"; 
}
T::~T() { 
--count; 
cout << "destructor called.\n"; 
}
void T::set_m1(int x) { 
m1 = x; 
}
int T::get_m1() const { 
return m1; 
}
int T::get_m2() const { 
return m2; 
}
void T::display() const { 
cout << m1 << ", " << m2 << endl; 
}

void T::disply_count() { 
cout << "T objects: " << count << endl;  
}
 
void func() { 
T t1; 
t1.set_m1(55); 
t1.m2 = 77; 
t1.display(); 
}

#include "t.h" 
void test() { 
cout << "T class info: " << T::doc << endl; 
cout << "T objects max_count: " << T::max_count << endl; 
T::disply_count(); 
T t1; 
t1.display(); 
t1.set_m1(42); 
T t2{t1}; 
t2.display(); 
T t3{std::move(t1)}; 
t3.display(); 
t1.display(); 
T::disply_count(); 
}
int main() { 
cout << "============测试类T============" << endl; 
test(); 
cout << endl; 
cout << "============测试友元函数func()============" << endl; 
func(); 
}

方式2

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

class T {
public:
T(int x = 0, int y = 0);
T(const T &t);
T(T &&t); 
~T();
void set_m1(int x);
int get_m1() const;
int get_m2() const;
void display() const;
friend void func();
private:
int m1, m2;
public:
static void disply_count();
public:
static const string doc;
static const int max_count;
private:
static int count;
};

const string T::doc{"a simple class"};
const int T::max_count = 99;
int T::count = 0;

T::T(int x, int y): m1{x}, m2{y} {
++count;
cout << "constructor called.\n";
}
T::T(const T &t): m1{t.m1}, m2{t.m2} {
++count;
cout << "copy constructor called.\n";
}
T::T(T &&t): m1{t.m1}, m2{t.m2} {
++count;
cout << "move constructor called.\n";
}
T::~T() {
--count;
cout << "destructor called.\n";
}
void T::set_m1(int x) {
m1 = x;
}
int T::get_m1() const {
return m1;
}
int T::get_m2() const {
return m2;
}
void T::display() const {
cout << m1 << ", " << m2 << endl;
}

void T::disply_count() {
cout << "T objects: " << count << endl;
}

void func() {
T t1;
t1.set_m1(55);
t1.m2 = 77;
t1.display();
}

#include "t.hpp"

void test() {
cout << "T class info: " << T::doc << endl;
cout << "T objects max_count: " << T::max_count << endl;
T::disply_count();
T t1;
t1.display();
t1.set_m1(42);
T t2{t1};
t2.display();
T t3{std::move(t1)};
t3.display();
t1.display();
T::disply_count();
}

int main() {
cout << "============测试类T============" << endl;
test();
cout << endl;
cout << "============测试友元函数func()============" << endl;
func();
}

任务2

#pragma once

#include <iostream>
#include <string>
#include <iomanip>
using std::string;
using std::cout;
using std::endl;
using std::setfill;
using std::setw;
using std::left;
using std::right;
using std::to_string;
struct Date {
int year;
int month;
int day;
};

class Employee
{
public:
Employee();
Employee(string name0, double salary0, int y, int m, int d = 1);
void set_info(string name0, double salary0, int y, int m, int d = 1);

string get_name() const;
double get_salary() const; 
void display_info() const;
void update_salary(double s);
void update_hire_date(int y, int m, int d);
void raise_salary(double by_percent);
public:
static void display_count();
private:
string id;
string name;
double salary;
Date hire_date;
public:
static const string doc;
private:
static int count;
};
const string Employee::doc {"a simple Employee class"};
int Employee::count = 0;

Employee::Employee(): id{ to_string(count+1) } {
++count;
}

Employee::Employee(string name0, double salary0, int y, int m, int d):
id{to_string(count+1)}, name{name0}, salary{salary0},
hire_date{y, m, d} {
++count;
}

void Employee::set_info(string name0, double salary0, int y, int m, int d)
{
name = name0;
salary = salary0;
hire_date.year = y;
hire_date.month = m;
hire_date.day = d;
}

string Employee::get_name() const {
return name;
}

double Employee::get_salary() const {
return salary;
}

void Employee::display_info() const {
cout << left << setw(15) << "id: " << id << endl;
cout << setw(15) << "name: " << name << endl;
cout << setw(15) << "salary: " << salary << endl;
cout << setw(15) << "hire_date: " << hire_date.year << "-";
cout << std::right << setfill('0') << setw(2) << hire_date.month << "-"
<< setw(2) << hire_date.day;
cout << setfill(' ');
}

void Employee::update_salary(double s) {
salary = s;
}

void Employee::update_hire_date(int y, int m, int d) {
hire_date.year = y;
hire_date.month = m;
hire_date.day = d;
}

void Employee::raise_salary(double by_percent) {
double raise = salary * by_percent / 100;
salary += raise;
}

void Employee::display_count() {
cout << "there are " << count << " employees\n";
}

#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(2019, 6, 30);
employee1.update_salary(35000);
employee1.display_info();
cout << endl << endl;
Employee employee2{"Tony", 20000, 2023, 3, 16};
employee2.raise_salary(15);
employee2.display_info();
cout << endl << endl;
Employee::display_count();
}
int main() {
test();
}

任务3

#pragma once
#include<iostream>
#include<cmath>
class Complex{ public :
    Complex(double r=0,double i=0){
        real=r;imag=i ;}
        Complex(const Complex &x){
            real=x.real;
            imag=x.imag;
        }


    double get_real() const{
        return real;
    }
    double  get_imag() const{
        return imag;
    }
    void show() const{
        using namespace std;
        if(real==0&&imag==0){cout<<0;}
        else if(real==0){cout<<imag<<"i";}
        else if(imag==0){cout<<real;}
        else{
            if(imag>0){
                cout<<real<<"+"<<imag<<"i";
            }

        else if(imag<0){
            cout<<real<<"-"<<-imag<<"i";
        }
        }
}


    void add( const Complex &x) {real+=x.real;
    imag+=x.imag;}
     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;


};
Complex add(const Complex &c1,const Complex &c2){
    double real=c1.real+c2.real;
    double imag=c1.imag+c2.imag;
    return Complex(real,imag);
}
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 &c1){
    return sqrt(c1.real*c1.real+c1.imag*c1.imag);
}

#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(); 
}

任务4

#pragma once

#include<iostream>
#include<string>

using namespace std;


class User {
public:
    User(string name,string passwd = "111111",string email = " "): N{name}, P{passwd}, E{email} {n++;}
    ~User() = default;    
 
    void set_email();
    void change_passwd();
    void print_info();
    static void print_n();
 
private:
    string N,P,E;
    static int n;
    
};
 
int User::n = 0;

void User::set_email()
{
    cout << "Enter email address: " ;
    cin >> E ;
    cout << "email is set successfully..." << endl;
}
 
void User::change_passwd()
{
    cout << "Enter old password: ";
    string temp;
    int i = 3;
    while(i)
    {
        cin >> temp;
        if(temp == P)
        {   
            cout << "Enter new passwd: ";
            cin >> P;  
            cout << "new passwd is set successfully..." << endl;
            break;
        }
        else 
        {
            i--;
            if(i != 0)
                cout << "password input error. Please re-enter again: " ;
        }
        if(i == 0)
        {
            cout << "password input error. Please try after a while." << endl;
        }
    }
 
}

void User::print_info()
{   
    string pp(P.size(), '*');
    cout << "name:   " << N << endl;
    cout << "passwd: " << pp << endl;
    cout << "email:  " << E << endl;
}
 
void User::print_n()
{
    cout << "there are " << n << " users." << endl;
}

#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("jaychou");
      user2.change_passwd();
      user2.set_email();
      user2.print_info();

      cout << endl;
      User::print_n();
 }

 int main(){
  test();
 }

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"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;
}

#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;
}