实验2

实验2.4

hpp：

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

cpp：

 1 #include "Complex.hpp"
 2 #include <iostream>
 3 void test(){
 4     using namespace std;
 5     
 6     Complex c1(2,-4);
 7     const Complex c2(1.5);
 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 }
41 int main(){
42     test();
43 }

实验2.5

hpp:

 1 #pragma once
 2 #include <iostream>
 3 #include <string>
 4 using namespace std;
 5 class User{
 6     public:
 7     User(string a="Mary",string b="111111",string c=""):name{a},passwd{b},email{c}{count++;};
 8     void print_info();
 9     void change_passwd();
10     void set_email();
11     static void print_n();    
12     private:
13         string name,passwd,email;static int count;
14 };
15 
16 void User::print_info(){
17     string s1(passwd.size(),'*');
18     cout<<"name: "<<name<<endl;
19     cout<<"passwd: "<<s1<<endl;
20     cout<<"email: "<<email<<endl;
21 }
22 
23 int User::count=0;
24 
25 void User::print_n(){
26     cout<<"There are "<<count<<" users."<<endl;
27 }
28 
29 void User::change_passwd(){
30     cout<<"Enter old password: ";
31     string s1;
32     int i=1;
33     cin>>s1;
34     for(i=1;i<=2;i++){
35         if(s1==passwd){
36             cout<<"Enter new passwd: ";
37             cin>>passwd;
38             break;
39         }
40         else{
41         cout<<"password input error.Please re-enter again:";
42             cin>>s1;
43         }
44     }
45     if(i==3){
46         cout<<"password input error.Please try after a while."<<endl;
47     }
48 }
49 
50 void User::set_email(){
51     cout<<"Enter email address: ";
52     cin>>email;
53     cout<<"email is set successfully..."<<endl;;    
54 }

cpp:

 1 #include "User.hpp"
 2 #include <iostream>
 3 void test(){
 4     using std::cout;
 5     using std::endl;
 6     
 7     cout<<"testing 1......\n";
 8     User user1("jonny","92197","[email protected]");
 9     user1.print_info();
10 
11     cout<<endl;
12     cout<<"testing 2......\n\n";
13         
14     User user2("Leonard");
15     user2.change_passwd();
16     user2.set_email();
17     user2.print_info();
18     
19     cout<<endl;
20     User::print_n();
21 }
22 int main(){
23     test();
24 }