试验任务三
complex.hpp
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#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);
}
complex.cpp
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#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();
}
试验任务四
User.hpp
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#include <iostream>
#include <string>
#include <limits>
class User {
private:
static int n;
public:
static void print_n();
private:
std::string name, password, email;
public:
User(std::string nm,
std::string p = "111111",
std::string e = ""): name{nm}, password{p}, email{e}
{
n += 1;
};
void set_email();
void change_passwd();
void print_info();
};
int User::n = 0;
void User::print_n() {
std::cout << "there are " << n << " users.\n";
}
void User::set_email() {
using namespace std;
cout << "Enter email address: ";
string e;
cin >> e;
cin.ignore((std::numeric_limits<streamsize>::max)(),'\n');
cout << "email is set successfully...\n";
email = e;
}
void User::change_passwd() {
using namespace std;
string o, n;
for (int i = 0; i <= 3; i++) {
if (i == 3) {
cout << "Please try after a while. \n";
break;
}
if (i == 0)
cout << "Enter old password: ";
else
cout << "Please re-enter again: ";
cin >> o;
cin.ignore((std::numeric_limits<streamsize>::max)(),'\n');
if (o != password) {
cout << "password input error. ";
continue;
}
else {
cout << "Enter new passwd: ";
cin >> n;
cin.ignore((std::numeric_limits<streamsize>::max)(),'\n');
password = n;
cout << "new passwd is set successfully...\n";
break;
}
}
}
void User::print_info() {
using namespace std;
cout << "name: \t" << name << endl;
string s(password.size(),'*'); cout << "password: \t" << s << endl;
cout << "email: \t" << email << endl;
}
task4.cpp
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1 #include "User.hpp"
2 #include <iostream>
3
4
5 void test(){
6 using std::cout;
7 using std::endl;
8
9 cout << "testing 1......\n";
10 User user1("Jonny", "92197", "xyz@hotmail.com");
11 user1.print_info();
12
13 cout << endl
14 << "testing 2......\n\n";
15
16 User user2("Leonard");
17 user2.change_password();
18 user2.set_email();
19 user2.print_info();
20
21 cout << endl;
22 User::print_n();
23 }
24
25 int main(){
26 test();
27 }
试验任务五
account.h
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1 //account.h
2 #ifndef __ACCOUNT_H__
3 #define __ACCOUNT_H__
4 class SavingsAccount { //储蓄账户类
5 private:
6 int id; //帐号
7 double balance; //余额
8 double rate; //存款的年利率
9 int lastDate; //上次变更余额的时期
10 double accumulation; //余额按日累加之和
11 static double total; //所有帐户的总金额
12 //记录一笔账,date为日期,amount为金额,desc为说明
13 void record(int date, double amount);
14 //获得到指定日期为止的存款金额按日累积值
15 double accumulate(int date) const {
16 return accumulation + balance * (date - lastDate);
17 }
18 public:
19 //构造函数
20 SavingsAccount(int date, int id, double rate);
21 int getId() const {return id;}
22 double getBalance() const {return balance;}
23 double getRate() const {return rate;}
24 static double getTotal() {return total;}
25 void deposit(int date, double amount); //存入现金
26 void withdraw(int date, double amount); //取出现金
27 //结算利息,每年1月1日调用一次该函数
28 void settle(int date);
29 //显示账户信息
30 void show() const;
31 };
32 #endif //__ACCOUNT _H__
account.cpp
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1 //account.cpp
2 #include "account.h"
3 #include <cmath>
4 #include <iostream>
5 using namespace std;
6
7 double SavingsAccount::total = 0;
8 //SavingsAccount类相关成员函数的实现
9 SavingsAccount::SavingsAccount(int date, int id, double rate)
10 : id(id), balance(0), rate(rate), lastDate (date), accumulation(0) {
11 cout << date << "\t#" << id << " is created" << endl;
12 }
13 void SavingsAccount::record(int date, double amount) {
14 accumulation = accumulate(date);
15 lastDate = date;
16 amount = floor(amount * 100 + 0.5) / 100; //保留小数点后两位
17 balance += amount;
18 total += amount;
19 cout << date << "\t#" << id << "\t" << amount << "\t" << balance << endl;
20 }
21 void SavingsAccount::deposit(int date, double amount) {
22 record(date, amount);
23 }
24 void SavingsAccount::withdraw(int date, double amount) {
25 if ( amount > getBalance())
26 cout << "Error: not enough money" << endl;
27 else
28 record(date, - amount);
29 }
30 void SavingsAccount::settle(int date) {
31 double interest = accumulate(date) * rate / 365;
32 //计算年息
33 if (interest != 0)
34 record(date, interest);
35 accumulation = 0;
36 }
37 void SavingsAccount::show() const {
38 cout << "#" << id << "\tBalance: " << balance;
39 }
5_11.cpp
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1 //5_11.cpp
2 #include "account.h"
3 #include <iostream>
4 using namespace std;
5 int main() {
6 //建立几个帐户
7 SavingsAccount sa0(1, 21325302, 0.015);
8 SavingsAccount sa1(1, 58320212, 0.015);
9 //几笔账目
10 sa0.deposit(5, 5000) ;
11 sa1.deposit(25, 10000);
12 sa0.deposit(45, 5500);
13 sa1.withdraw(60, 4000);
14 //开户后第90天到了银行的计息日,结算所有账户的年息
15 sa0.settle(90);
16 sa1.settle(90);
17 //输出各个帐户信息
18 sa0.show();cout << endl;
19 sa1.show();cout << endl;
20 cout << "Total:" << SavingsAccount::getTotal() << endl;
21 return 0;
22 }
