//第一个任务简单Complex类
#pragma once #include <iostream> #include <cmath> class Complex { public: Complex(double x0 = 0, double y0 = 0); // 构造函数 Complex(const Complex& c); // 拷贝构造函数 ~Complex(){}; // 析构函数 double get_real() const; // 获取实部 double get_imag() const; // 获取虚部 void show() const; // 显示复数 void add(const Complex &c); // 复数相加 friend Complex add(const Complex &c1, const Complex &c2); // 友元函数，复数相加 friend bool is_equal(const Complex &c1, const Complex &c2); // 友元函数，判断两个复数是否相等 friend void abs(const Complex &c); // 友元函数，计算复数的模 private: double real, imag; // 实部和虚部 }; Complex::Complex(double x0, double y0) : real{x0}, imag{y0} {} // 构造函数的实现 Complex::Complex(const Complex& c) : real{c.real}, imag{c.imag} {} // 拷贝构造函数的实现 double Complex::get_real() const { return real; } double Complex::get_imag() const { return imag; } void Complex::show() const { std::cout << real; if (imag > 0) std::cout << "+" << imag << "i"; if (imag < 0) std::cout << imag << "i"; } void Complex::add(const Complex& c) { real += c.real; imag += c.imag; } Complex add(const Complex& c1, const Complex& c2) { Complex c3; c3.real = c1.real + c2.real; c3.imag = c1.imag + c2.imag; return c3; } void abs(const Complex& c) { double mo = sqrt(c.real * c.real + c.imag * c.imag); std::cout << mo; } bool is_equal(const Complex& c1, const Complex& c2) { return c1.real == c2.real && c1.imag == c2.imag; } #pragma once 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)="; abs(c1); cout << 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; }
#include"Complex.hpp"
int main() {
test();
return 0;
}
//第二个User类简单版本
#pragma once
#include<iostream>
#include <string>
#include <vector>
using namespace std;
class User {
public:
// 构造函数，包含密码和电子邮件的默认值
User(const string& name0, const string& passwd0 = "111111", const string& email0 = "");
// 析构函数
~User();
// 设置用户的电子邮件地址
void set_email();
// 更改用户的密码
void change_passwd();
// 打印用户信息
void print_info() const;
// 静态方法，用于打印用户对象的数量
static void print_n();
private:
string name, email, passwd; // 用户数据
int c = 3; // 最大密码更改尝试次数设置成私有，防止篡改无限多次
// 验证电子邮件地址有没有@
void isValidEmail(const stri
//Usermain.cpp
#include "User1.hpp"
#include<iostream>
using namespace std;
void test() {
cout << "测试 1......\n";
User user1("Jonny", "92197", "[email protected]");
user1.print_info();
cout << endl << "测试 2......\n\n";
User user2("Leonard");
user2.change_passwd();
user2.set_email();
user2.print_info();
cout << endl;
User::print_n();
}
int main() {
test();
}
ng& oldEmail0, const string& newEmail0);
private:
static int n; // 用户对象数量的静态成员变量
};
int User::n = 0;
User::User(const string& name0, const string& passwd0, const string& email0)
: name(name0), passwd(passwd0), email(email0) {
++n;
}
User::~User() {
--n;
}
//错误1：//默认形参只能声明时候写
void User::isValidEmail(const string& oldEmail0, const string& newEmail0) {
string newEmail = newEmail0;
string oldEmail = oldEmail0;
vector<string> v{oldEmail, newEmail};
for (auto& s : v) {
//s.npos 是std::string类中的一个很大的静态成员变量
auto pos = s.find("@");
if (pos == string::npos)//
{
cout << "Email format is missing @" << endl;
} else {
email = newEmail;
cout << "Email is set successfully" << endl;
}
}
}
void User::set_email() {
cout << "Enter email address: ";
string newEmail;
cin >> newEmail;
cout << newEmail;
isValidEmail(email, newEmail);
}
void User::change_passwd() {
cout << "Name: " << name << endl;
string hidden_passwd(passwd.size(), '*');
cout << "Password: " << hidden_passwd << endl;
cout << "Email: " << email;
cout << "Enter old password: ";
string oldPasswd, newPasswd;
int i = c;
while (i) {
cin >> oldPasswd;
if (oldPasswd == passwd) {
cout << "Enter new password: ";
cin >> newPasswd;
passwd = newPasswd;
cout << "New password is set successfully..." << endl;
break;
} else {
i--;
if (i != 0)
cout << "Password input error. Please re-enter: ";
}
if (i == 0) {
cout << "Password input error. Please try again later.";
exit(1);//强行退出函数
}
}
}
void User::print_info() const {
cout << "Name: " << name << endl;
string hidden_passwd(passwd.size(), '*');
cout << "Password: " << hidden_passwd << endl;
cout << "Email: " << email << endl;
}
void User::print_n() {
cout << "There are " << n << " users." << endl;
}
//Usermain.cpp
#include "User1.hpp"
#include<iostream>
using namespace std;
void test() {
cout << "测试 1......\n";
User user1("Jonny", "92197", "[email protected]");
user1.print_info();
cout << endl << "测试 2......\n\n";
User user2("Leonard");
user2.change_passwd();
user2.set_email();
user2.print_info();
cout << endl;
User::print_n();
}
int main() {
test();
}
//第三个任务课本银行类
//account.h
#pragma once
class SavingsAccount{ //储存账户类
private:
int id; //账号
double balance; //余额
double rate; //存款年利率
int lastDate; //上次变更余额时期
double accumulation; //余额按日累加之和
static double total;
//记录一笔账，date为日期，amount为余额，desc为说明
void record(int date,double amount);
//获得到指定日期为止的存款金额按日累计值
double accumulate(int date) const{
return accumulation + balance * (date-lastDate);}
public:
//构造函数
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 date, double amount); //存入现金
void withdraw(int date, double amount) ; //取出现金
void settle(int date);
//显示账户信息
void show() const;
};
//account.cpp
#include"account.h"
#include<cmath>
#include<iostream>
using namespace std;
double SavingsAccount::total=0;
//SavingAccount 类相关成员函数的实现
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;
}
//5_11.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;
}
实验一错误
在编程的时候忘记初始化析构函数，多文件编程的时候造成编译器报错但不知道如何找原因，放在单文件的时候报错信息才发现问题。
实验二收获
一：学习了运用sring类的find函数，查找字符 二：学习了如何隐藏密码 三：运用了exit（）函数返回1为异常，返回0为正常
四：运用容器for循环 编程错误：默认形参写了两遍
标签：const,对象,double,void,编程,int,Complex,实验,include From： https://www.cnblogs.com/xiaochengxiatian/p/17781113.html