1.实验四 Complex类的实现
1 #include<iostream>
2 #include<cmath>
3 using namespace std;
4 class Complex
5 {
6 private:
7 double real;
8 double imag;
9 public:
10 Complex(double r=0.0,double i=0.0)
11 {
12 real=r;
13 imag=i;
14 }
15 Complex(Complex &c)
16 {
17 real=c.real;
18 imag=c.imag;
19 }
20 double get_real() const
21 {
22 return real;
23 }
24 double get_imag() const
25 {
26 return imag;
27 }
28 void show() const
29 {
30 if(imag>0)
31 cout<<real<<"+"<<imag<<"i"<<endl;
32 else if(imag==0)
33 cout<<real<<endl;
34 else
35 cout<<real<<imag<<"i"<<endl;
36 }
37 void add(const Complex &c1)
38 {
39 real=real+c1.real;
40 imag=imag+c1.imag;
41 }
42 friend Complex add(const Complex &c2,const Complex &c3)
43 {
44 Complex c4;
45 c4.real=c2.real+c3.real;
46 c4.imag=c2.imag+c3.imag;
47 return c4;
48 }
49 friend bool is_equal(const Complex &c5,const Complex &c6)
50 {
51 if(c5.real==c6.real&&c5.imag==c6.imag)
52 return true;
53 else
54 return false;
55 }
56 friend double abs(Complex c7)
57 {
58 double model;
59 model=sqrt(c7.imag*c7.imag+c7.real*c7.real);
60 return model;
61 }
62 };
运行结果：
2. 实验五 User类实现
1 #include<iostream>
2 #include<cmath>
3 #include<string>
4 using namespace std;
5 class User
6 {
7 private:
8 string name;
9 string password;
10 string email;
11 static int count;
12
13 public:
14
15 User(string n,string p={"111111"},string e={" "}):name{n},password{p},email{e}
16 {
17 count++;
18 }
19 ~User()
20 {
21 count--;
22 }
23 void set_email()
24 {
25 cout<<"Enter email address: ";
26 cin>>email;
27 cout<<"email is set successfully"<<endl;
28 }
29 void change_password()
30 {
31 string oldpassword;
32 int i=1;
33 cout<<"Enter old password: ";
34 cin>>oldpassword;
35 while(i)
36 {
37 if(oldpassword.compare(password)!=0)
38 {
39 i++;
40 if(i>3)
41 {
42 cout<<"please try after a while"<<endl;
43 break;
44 }
45 cout<<"password input error. Please re-enter again: ";
46 cin>>oldpassword;
47 continue;
48
49 }
50 else
51 {
52 string newpassword;
53 cout<<"Enter new password: ";
54 cin>>newpassword;
55 cout<<"password is set successfully"<<endl;
56 password=newpassword;
57 break;
58 }
59 }
60 }
61 void print_info()
62 {
63 cout<<"name: "<<name<<endl;
64 string secret=password;
65 int i;
66 cout<<"password: ";
67 for(i=1;i<=secret.length();i++)
68 cout<<"*";
69 cout<<endl;
70 cout<<"email: "<<email<<endl;
71 }
72 static int get_count()
73 {
74 cout<<count<<endl;
75 return count;
76 }
77 };
78 int User::count=0;
运行结果：
