实验任务1
demo1.dev
方法一
#ifndef T_H
#define T_H
#include <iostream>
#include <string>
using namespace std;
// 类T的声明
class T {
public:
T(int x = 0, int y = 0); // 带有默认形值的构造函数
T(const T &t); // 复制构造函数
T(T &&t); // 移动构造函数
~T(); // 析构函数
void set_m1(int x); // 设置T类对象的数据成员m1
int get_m1() const; // 获取T类对象的数据成员m1
int get_m2() const; // 获取T类对象的数据成员m2
void display() const; // 显示T类对象的信息
friend void func(); // 声明func()为T类友元函数
private:
int m1, m2;
public:
static void disply_count(); // 类方法，显示当前T类对象数目
public:
static const string doc; // 类属性，用于描述T类
static const int max_count; // 类属性，用于描述T类对象的上限
private:
static int count; // 类属性，用于描述当前T类对象数目
};
void func(); // 普通函数声明
#endif
t.h
#include "t.h"
// 类的static数据成员：类外初始化
const string T::doc {
"a simple class"
};
const int T::max_count = 99;
int T::count = 0;
// 类T的实现
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;
}
// 类方法
void T::disply_count() {
cout << "T objects: " << count << endl;
}
// 函数func()：实现
void func() {
T t1;
t1.set_m1(55);
t1.m2 = 77; // 虽然m2是私有成员，依然可以直接访问
t1.display();
}
t.cpp
#include "t.h"
// 测试
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();
}
// 主函数
int main() {
cout << "============测试类T============" << endl;
test();
cout << endl;
cout << "============测试友元函数func()============" << endl;
func();
}
main.cpp
运行结果
方法二
#pragma once
#include <iostream>
#include <string>
using namespace std;
// 类T的声明
class T {
public:
T(int x = 0, int y = 0); // 带有默认形值的构造函数
T(const T &t); // 复制构造函数
T(T &&t); // 移动构造函数
~T(); // 析构函数
void set_m1(int x); // 设置T类对象的数据成员m1
int get_m1() const; // 获取T类对象的数据成员m1
int get_m2() const; // 获取T类对象的数据成员m2
void display() const; // 显示T类对象的信息
friend void func(); // 声明func()为T类友元函数
private:
int m1, m2;
public:
static void disply_count(); // 类方法，显示当前T类对象数目
public:
static const string doc; // 类属性，用于描述T类
static const int max_count; // 类属性，用于描述T类对象的上限
private:
static int count; // 类属性，用于描述当前T类对象数目
};
// 类的static数据成员：类外初始化
const string T::doc {
"a simple class"
};
const int T::max_count = 99;
int T::count = 0;
// 类T的实现
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;
}
// 类方法
void T::disply_count() {
cout << "T objects: " << count << endl;
}
// 函数func()：实现
void func() {
T t1;
t1.set_m1(55);
t1.m2 = 77; // 虽然m2是私有成员，依然可以直接访问
t1.display();
}
t.hpp
#include "t.hpp"
// 测试
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();
}
// 主函数
int main() {
cout << "============测试类T============" << endl;
test();
cout << endl;
cout << "============测试友元函数func()============" << endl;
func();
}
main.cpp
运行结果
实验任务2
demo2.dev
#pragma once
// Employee类的定义
#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;
};
// Employee类的声明
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);
// 设置雇员信息
string get_name() const; // 获取雇员姓名
double get_salary() const; // 获取雇员薪水
void display_info() const; // 显示雇员信息
void update_salary(double s); // 更新雇员薪水
void update_hire_date(int y, int m, int d); // 更新雇佣日期
void raise_salary(double by_percent); // 计算提薪加成
public:
static void display_count(); // 类方法，显示雇员总数
private:
string id; // 雇员工号
string name; // 雇员姓名
double salary; // 雇员薪水
Date hire_date; // 雇员雇佣日期
public:
static const string doc; // 类属性，用于描述类
private:
static int count; // 类属性，用于记录雇员总人数
};
const string Employee::doc {
"a simple Employee class"
};
int Employee::count = 0;
// 默认构造函数
Employee::Employee(): id { to_string(count+1) } {
++count;
}
// 带参数的构造函数
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;
}
// 设置员工信息
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;
}
// 获取员工姓名
string Employee::get_name() const {
return name;
}
// 获取员工薪水
double Employee::get_salary() const {
return salary;
}
// 显示雇员信息
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(' '); // 恢复到默认空格填充
}
// 更新薪水
void Employee::update_salary(double s) {
salary = s;
}
// 更新雇佣日期
void Employee::update_hire_date(int y, int m, int d) {
hire_date.year = y;
hire_date.month = m;
hire_date.day = d;
}
// 雇员提薪加成
// by_percent是提升比例
void Employee::raise_salary(double by_percent) {
double raise = salary * by_percent / 100;
salary += raise;
}
// 类方法
// 显示雇员总数
void Employee::display_count() {
cout << "there are " << count << " employees\n";
}
empolyee.hpp
#include "Employee.hpp"
#include <iostream>
// 测试：Employee类
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); // 提成15%
employee2.display_info();
cout << endl << endl;
Employee::display_count();
}
int main() {
test();
}
main.cpp
运行结果
实验任务3
demo3.dev
#include "Complex.h"
#include <cmath>
Complex::Complex(double r, double i) : real(r), imag(i) {}
Complex::Complex(const Complex& other) : real(other.real), imag(other.imag) {}
double Complex::get_real() const {
return real;
}
double Complex::get_imag() const {
return imag;
}
void Complex::show() const {
using namespace std;
cout << real;
if (imag != 0) {
if (imag > 0)
cout << " + " << imag << "i";
else
cout << " - " << -imag << "i";
}
}
Complex& Complex::add(const Complex& other) {
real += other.real;
imag += other.imag;
return *this;
}
Complex add(const Complex& c1, const Complex& c2) {
Complex result(c1);
return result.add(c2);
}
bool is_equal(const Complex& c1, const Complex& c2) {
return (c1.real == c2.real) && (c1.imag == c2.imag);
}
double abs(const Complex& c1) {
return sqrt(c1.real * c1.real + c1.imag * c1.imag);
}
complex.cpp
#ifndef COMPLEX_H
#define COMPLEX_H
class Complex {
private:
double real;
double imag;
public:
Complex(double r = 0, double i = 0);
Complex(const Complex& other);
double get_real() const;
double get_imag() const;
void show() const;
Complex& add(const Complex& other);
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);
};
#endif
complex.h
#include <iostream>
#include "Complex.h"
using namespace std;
void test() {
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) = " << 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();
}
main.cpp
实验任务4
#ifndef USER_HPP
#define USER_HPP
#include <iostream>
#include <string>
class User {
private:
std::string name;
std::string passwd;
std::string email;
static int n;
public:
User(const std::string& username, const std::string& password = "111111", const std::string& mail = "")
: name(username), passwd(password), email(mail) {
n++;
}
void set_email() {
std::cout << "Enter email address: ";
std::cin >> email;
std::cout << "Email is set successfully..." << std::endl;
}
void change_passwd() {
std::string old_password, new_password;
int attempts = 0;
std::cout << "Enter old password: ";
std::cin >> old_password;
while (old_password != passwd) {
attempts++;
if (attempts >= 3) {
std::cout << "Password input error. Please try after a while." << std::endl;
return;
}
std::cout << "Password input error. Please re-enter again: ";
std::cin >> old_password;
}
std::cout << "Enter new password: ";
std::cin >> new_password;
passwd = new_password;
std::cout << "Password changed successfully." << std::endl;
}
void print_info() {
std::cout << "name: " << name << std::endl;
std::cout << "passwd: ";
for (size_t i = 0; i < passwd.length(); ++i) {
std::cout << '*';
}
std::cout << std::endl;
std::cout << "email: " << email << std::endl;
}
static void print_n() {
std::cout << "there are " << n << " users." << std::endl;
}
};
int User::n = 0;
#endif // USER_HPP
user.hpp
#include "User.hpp"
#include <iostream>
void test() {
using std::cout;
using std::endl;
cout << "testing 1......." << endl;
User user1("Jonny", "92197", "xyz@hotmail.com");
user1.print_info();
cout << endl << "testing 2......" << endl << endl;
User user2("Leonard");
user2.change_passwd();
user2.print_info(); // Output after changing password
user2.set_email();
user2.print_info(); // Output after setting email
cout << endl;
User::print_n();
}
int main() {
test();
return 0;
}
task4.cpp
运行结果
#include <iostream>
#include <string>
#include <vector>
class User {
private:
std::string name;
std::string passwd;
std::string email;
static int n;
public:
User(const std::string& username, const std::string& password = "111111", const std::string& mail = "")
: name(username), passwd(password), email(mail) {
n++;
}
void set_email() {
std::cout << "Enter email address: ";
std::cin >> email;
while (!is_valid_email(email)) {
std::cout << "Invalid email address. Please enter a valid email: ";
std::cin >> email;
}
std::cout << "Email is set successfully..." << std::endl;
}
void change_passwd() {
std::string old_password, new_password;
int attempts = 0;
std::cout << "Enter old password: ";
std::cin >> old_password;
while (old_password != passwd) {
attempts++;
if (attempts >= 3) {
std::cout << "Password input error. Please try after a while." << std::endl;
return;
}
std::cout << "Password input error. Please re-enter again: ";
std::cin >> old_password;
}
std::cout << "Enter new password: ";
std::cin >> new_password;
while (!is_valid_password(new_password)) {
std::cout << "Invalid password. Password must be at least 6 characters. Enter new password: ";
std::cin >> new_password;
}
passwd = new_password;
std::cout << "Password changed successfully." << std::endl;
}
void print_info() {
std::cout << "name: " << name << std::endl;
std::cout << "passwd: " << std::string(passwd.size(), '*') << std::endl;
std::cout << "email: " << email << std::endl;
}
static void print_n() {
std::cout << "there are " << n << " users." << std::endl;
}
private:
bool is_valid_email(const std::string& email) {
return email.find('@') != std::string::npos;
}
bool is_valid_password(const std::string& password) {
return password.length() >= 6;
}
};
int User::n = 0;
void test1() {
std::string s1{"hello"};
std::string s2(s1.size(), '*');
std::cout << "s1: " << s1 << std::endl;
std::cout << "s2: " << s2 << std::endl;
}
void test2() {
std::vector<std::string> v{"xyz@gmail.com", "xyz.gmail.com"};
bool is_valid;
for (auto &s : v) {
auto pos = s.find("@");
if (pos == std::string::npos)
is_valid = false;
else
is_valid = true;
std::cout << s << "\t" << std::boolalpha << is_valid << std::endl;
}
}
int main() {
std::cout << "测试1:" << std::endl;
test1();
std::cout << "\n测试2:" << std::endl;
test2();
return 0;
}
View Code
运行结果
实验任务5
# 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 date, double amount);
double accumulate(int date) const {
return accumulation+balance * (date-lastDate);
}
public:
SavingsAccount(int date, int id, double rate);
int getld() 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 date, double amount);
void settle(int date);
void show() const;
};
#endif
account.h
# 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;
}
account.cpp
#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;
}
5_11.cpp
运行结果
标签：std,const,string,对象,double,void,编程,int,实验 From： https://www.cnblogs.com/le-sh/p/17767018.html