task3

Complex.hpp原始碼：

 1 #ifndef COMPLEX_HPP
 2 #define COMPLEX_HPP
 3 
 4 #include<iostream>
 5 #include<cmath>
 6 
 7 using namespace std;
 8 
 9 class Complex {
10     private:
11         double real;
12         double imag;
13     public:
14         Complex();
15         Complex(double
 
 real0);
16         Complex(double real0,double imag0);
17         Complex(const Complex &obj);
18 
19         double get_real()const;
20         double get_imag()const;
21         void show()const;
22         void add(const Complex &obj);
23 
24         friend Complex add(Complex obj1,Complex obj2);
 
25         friend bool is_equal(const Complex &obj1,const Complex &obj2);
26         friend double abs(const Complex &obj);
27 };
28 
29 Complex::Complex() {
30     real=imag=0;
31 }
32 Complex::Complex(double real0) {
33     real=real0;
34     imag=0;
35 }
36 Complex::Complex(double real0,double
 
 imag0) {
37     real=real0;
38     imag=imag0;
39 }
40 Complex::Complex(const Complex &obj) {
41     real=obj.real;
42     imag=obj.imag;
43 }
44 
45 double Complex::get_real()const {
46     return real;
47 }
48 double Complex::get_imag()const {
49     return imag;
50 }
51 void Complex::show()const {
52     if(imag!=0)
53         cout<<real<<imag<<"i";
54     else
55         cout<<real;
56 }
57 void Complex::add(const Complex &obj) {
58     real=real+obj.real;
59     imag=imag+obj.imag;
60 }
61 
62 Complex add(Complex obj1,Complex obj2) {
63     obj1.real=obj1.real+obj2.real;
64     obj1.imag=obj1.imag+obj2.imag;
65     return obj1;
66 }
67 bool is_equal(const Complex &obj1,const Complex &obj2) {
68     if(obj1.real==obj2.real&&obj1.imag==obj2.imag) return true;
69     else return false;
70 }
71 double abs(const Complex &obj) {
72     return sqrt(pow(obj.real,2)+pow(obj.imag,2));
73 }
74 
75 #endif

Complex.cpp原始碼：

 1 #include"Complex.hpp"
 2 #include<iostream>
 3 int main() {
 4     using namespace std;
 5 
 6     Complex c1(10, -1);
 7     const Complex c2(15.2);
 8     Complex c3(c1);
 9 
10     cout << "c1 = ";
11     c1.show();
12     cout << endl;
13 
14     cout << "c2 = ";
15     c2.show();
16     cout << endl;
17     cout << "c2.imag = " << c2.get_imag() << endl;
18 
19     cout << "c3 = ";
20     c3.show();
21     cout << endl;
22 
23     cout << "abs(c1) = ";
24     cout << abs(c1) << endl;
25 
26     cout << boolalpha;
27     cout << "c1 == c3 : " << is_equal(c1, c3) << endl;
28     cout << "c1 == c2 : " << is_equal(c1, c2) << endl;
29 
30     Complex c4;
31     c4 = add(c1, c2);
32     cout << "c4 = c1 + c2 = ";
33     c4.show();
34     cout << endl;
35 
36     c1.add(c2);
37     cout << "c1 += c2, " << "c1 = ";
38     c1.show();
39     cout << endl;
40 }

測試結果：

task4

User.hpp原始碼：

 1 #ifndef USER_HPP
 2 #define USER_HPP
 3 
 4 #include<iostream>
 5 #include<string>
 6 
 7 using namespace std;
 8 
 9 class User {
10     private:
11         string name;
12         string passwd;
13         string email;
14         static int n;
15     public:
16         User(string name0);
17         User(string name0,string passwd0,string email0);
18         void set_email();
19         void change_passwd();
20         void print_info();
21         static void print_n();
22 };
23 
24 int User::n=0;
25 
26 User::User(string name0) {
27     name=name0;
28     passwd="111111";
29     email="";
30     n++;
31 }
32 User::User(string name0,string passwd0,string email0) {
33     name=name0;
34     passwd=passwd0;
35     email=email0;
36     n++;
37 }
38 
39 void User::set_email() {
40     cout<<"Enter email address: ";
41     cin>>email;
42     cout<<"email is set successfully..."<<endl;
43 }
44 void User::change_passwd() {
45     cout<<"Enter old password: ";
46     string s;
47     cin>>s;
48     int i;
49     for(i=1; i<=2; i++) {
50         if(s==passwd) break;
51         cout<<"password input error.Please re-enter again: ";
52         cin>>s;
53     }
54     if(s!=passwd) cout<<"password input error. Please try after a while."<<endl;
55     else {
56         cout<<"Enter new passwd: ";
57         cin>>s;
58         passwd=s;
59         cout<<"new passwd is set successfully..."<<endl;
60     }
61 }
62 
63 void User::print_info() {
64     cout<<"name: "<<name<<endl;
65     cout<<"passwd: "<<"******"<<endl;
66     cout<<"email: "<<email<<endl;
67 }
68 
69 void User::print_n() {
70     cout<<"there are "<<n<<" users."<<endl;
71 }
72 
73 #endif

User.cpp原始碼：

 1 #include "User.hpp"
 2 #include <iostream>
 3 
 4 int main() {
 5     using namespace std;
 6 
 7     cout << "testing 1......" << endl;
 8     User user1("馬化騰", "10001", "[email protected]");
 9     user1.print_info();
10 
11     cout << endl
12          << "testing 2......" << endl
13          << endl;
14     User user2("馬雲");
15     user2.change_passwd();
16     user2.set_email();
17     user2.print_info();
18 
19     User::print_n();
20 }

測試結果：