3.实验任务3
1 #pragma once
2
3 #include <iostream>
4 #include <cmath>
5
6 class Complex {
7 public:
8 Complex(double r = 0, double i = 0) : real(r), imag(i) {}
9
10 double get_real() const {
11 return real;
12 }
13
14 double get_imag() const {
15 return imag;
16 }
17
18 void add(const Complex &c) {
19 real += c.get_real();
20 imag += c.get_imag();
21 }
22
23 void show() const {
24 std::cout << real;
25 if (imag > 0) {
26 std::cout << " + " << abs(imag) << "i";
27 }
28 else if (imag < 0) {
29 std::cout << " - " << abs(imag) << "i";
30 }
31 }
32
33 friend Complex add(const Complex &c1, const Complex &c2);
34 friend bool is_equal(const Complex &c1, const Complex &c2);
35 friend double abs(const Complex &c);
36
37 private:
38 double real;
39 double imag;
40 };
41
42 Complex add(const Complex &c1, const Complex &c2) {
43 return Complex(c1.get_real() + c2.get_real(), c1.get_imag() + c2.get_imag());
44 }
45
46 bool is_equal(const Complex &c1, const Complex &c2) {
47 return c1.get_real() == c2.get_real() && c1.get_imag() == c2.get_imag();
48 }
49
50 double abs(const Complex &c) {
51 return sqrt(pow(c.get_real(), 2) + pow(c.get_imag(), 2));
52 }
complex.hpp
1 #include "complex.hpp"
2
3 // 复数类Complex: 测试
4 void test() {
5 using namespace std;
6
7 Complex c1(3, -4);
8 const Complex c2(4.5);
9 Complex c3(c1);
10
11 cout << "c1 = ";
12 c1.show();
13 cout << endl;
14
15 cout << "c2 = ";
16 c2.show();
17 cout << endl;
18 cout << "c2.imag = " << c2.get_imag() << endl;
19
20 cout << "c3 = ";
21 c3.show();
22 cout << endl;
23
24 cout << "abs(c1) = ";
25 cout << abs(c1) << endl;
26
27 cout << boolalpha;
28 cout << "c1 == c3 : " << is_equal(c1, c3) << endl;
29 cout << "c1 == c2 : " << is_equal(c1, c2) << endl;
30
31 Complex c4;
32 c4 = add(c1, c2);
33 cout << "c4 = c1 + c2 = ";
34 c4.show();
35 cout <<endl;
36
37 c1.add(c2);
38 cout << " c1 += c2, " << " c1 = ";
39 c1.show();
40 cout << endl;
41 }
42
43 int main(){
44 test();
45 }
main.cpp
4.实验任务4
1 #ifndef USER_H
2 #define USER_H
3
4 #include <iostream>
5 #include <string>
6 #include <vector>
7
8 class User {
9 private:
10 std::string name;
11 std::string password;
12 std::string email;
13 static int n;
14
15 public:
16 static void print_n();
17
18 User(std::string x, std::string y = "111111", std::string z = " ")
19 : name(x), password(y), email(z) {
20 ++n;
21 }
22
23 ~User() {
24 --n;
25 }
26
27 void set_email() {
28 std::string a;
29 std::cout << "Enter email address: ";
30 std::cin >> a;
31 email = a;
32 std::cout << "Email is set successfully..." << std::endl;
33 }
34
35 void change_password() {
36 int count = 0;
37 std::string b, c;
38 std::cout << "Enter old password: ";
39 std::cin >> b;
40 while (b != password) {
41 count++;
42 std::cout << "Password input error. Please re-enter it: ";
43 std::cin >> b;
44 if (count >= 2) {
45 std::cout << "Password input error. Please try again after a while." << std::endl;
46 break;
47 }
48 }
49 if (b == password) {
50 std::cout << "Enter new password: ";
51 std::cin >> c;
52 password = c;
53 std::cout << "New password is set successfully..." << std::endl;
54 }
55 }
56
57 void print_info() {
58 std::string masked_password(password.size(), '*');
59 std::cout << "Name: " << name << std::endl;
60 std::cout << "Password: " << masked_password << std::endl;
61 std::cout << "Email: " << email << std::endl;
62 }
63 };
64
65 int User::n = 0;
66
67 void User::print_n() {
68 std::cout << "There are " << n << " users" << std::endl;
69 }
70
71 #endif
User.hpp
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", "[email protected]");
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 }
task4.cpp
5.实验任务5
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.h
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 }
account.cpp
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 }
5_11.cpp
标签：std,cout,对象,double,void,int,实验,include From： https://www.cnblogs.com/ZJY1203/p/17780870.html