3.
c.hpp
#include <iostream> #include <cmath> class Complex { public: Complex(double r = 0, double i = 0); Complex(const Complex& c); double get_real() const; double get_imag() const; void show() const; void add(const Complex& c1); private: double real, imag; public: friend Complex add(const Complex& c1, const Complex& c2) { return (c1.get_real() + c2.get_real(), c1.get_real() + c2.get_real()); } friend bool is_equal(const Complex& c1, const Complex& c2) { if (c1.real == c2.real && c1.imag == c2.imag) return 1; else return 0; } friend double abs(const Complex& c1) { return sqrt(c1.real * c1.real + c1.imag * c1.imag); } }; Complex::Complex(double r , double i ) { real = r; imag = i; } Complex::Complex(const Complex& c) { real = c.real; imag = c.imag; } double Complex::get_real() const { return real; } double Complex::get_imag() const { return imag; } void Complex::show()const { std::cout << real << "+" << (imag) << "i"; } void Complex::add(const Complex& c1) { real = real + (c1.real); imag = imag + (c1.imag); }
#include"c.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 = ";
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();
system("pause");
}
4.User.hpp
#pragma once
#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class User
{public:
User(string name = "Mary", string passwd = "111111", string email = "NULL");
string set_email();
void change_passwd();
void print_info();
void static print_n();
private:
string name, passwd, email;
private:
static int count;
};
int User::count = 0;
User::User(string n , string p , string e ) {
name = n;
passwd = p;
email = e;
count++;
}
string User::set_email(){
return email;
}
void User::change_passwd() {
cout << "Enter Old password" << endl;
int i = 0;string s3;
std::cin >> s3;
for (i = 0;i <=2;i++)
{
if ( s3!= passwd)
{
cout << "password input error.Please re-enter again" << endl;
}
else if (i == 2)
{
cout << "password input error.Please try after a while" << endl;
}
i++;
}
}
void User::print_info() {
string s1 = User::passwd;
string s2(s1.size(), '*');
cout << name << "`" << s2 << "`" << email << endl;
}
void User::print_n() {
cout << "there are"<<count <<"users" << endl;
}
User.cpp
#include "User.hpp"
#include <iostream>
// 测试User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();}
5.account.h
#ifndef ACCOUNT_H
#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;
}
#define ACCOUNT_H
class SavingsAccount {
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_ _
account.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;
}
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; }
标签：real,const,int,double,Complex,实验,include From： https://www.cnblogs.com/32re/p/17781361.html