task.3
.hpp
#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);
}
View Code
.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();
}
View Code
task.4
.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 << "passwword input error. Please try after a while" << endl;
break;
}
}
if (p == passwd){
cout << " Enter new passwd: ";
cin >> a;
cout << "new passwd is set successfully...";
}
}
void User::print_info(){
string s(passwd.size(), '*');
cout << "name: " << name << endl;
cout << "passwd: " << s << endl;
cout << "email: " << email << endl;
}
void User::print_n(){
cout << "there are " << n << "users" << endl;
}
View Code
.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", "[email protected]");
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();
}
View Code
task.5
.hpp
#ifndef ACCOUNT_H
#define ACCOUNT_H
class SavingsAccount { //储蓄账户类
private:
int id; //账号
double balance; //余额
double rate; //存款的年利率
int lastDate; //上次变更余额的时期
double accumulation; //余额按日累加之和
static double total; //所有账户的总金额
//记录一笔账，date为日期，amount为金额，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积累值
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 getBlance() 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
//结算利息，每年1月1日调用一次该函数
void settle(int date);
//显示账户信息
void show() const;
};
#endif //_ _ACCOUNT_H_ _
View Code
.cpp
#include "account.h"
#include <cmath>
#include <iostream>
using namespace std;
double SavingsAccount::total = 0;
//SavingsAccount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; //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;
}
View Code
.cpp
#include "account.h"
#include <iostream>
using namespace std;
int main(){
//建立几个账户
SavingsAccount sa0(1, 21325302, 0.015);
SavingsAccount sa1(1, 58320212, 0.015);
//几笔账目
sa0.deposit(5, 5000);
sa1.deposit(25, 10000);
sa0.deposit(45, 5500);
sa1.withdraw(60, 4000);
//开户后第90天到了银行的计息日，结算所有账户的年息
sa0.settle(90);
sa1.settle(90);
//输出各个账户信息
sa0.show(); cout << endl;
sa1.show(); cout << endl;
cout << "Total: " << SavingsAccount::getTotal() << endl;
return 0;
}
View Code
标签：const,cout,int,double,void,实验,include From： https://www.cnblogs.com/qazmlp10/p/17780986.html