实验一 类与对象

TASK 3：Complex.hpp

 1 #include<math.h>
 2 #include<iostream>
 3 using namespace std;
 4 class Complex
 5 {
 6   private: double real,imag;
 7   public:
 8       Complex(double r=0,double i=0):real(r),imag(i){}
 9       
10         Complex(const Complex &c){
11             real=c.real;
12             imag=c.imag;
13         }//构造复制函数 
14         double get_real() const;//返回实部 
15         double get_imag() const;//返回虚部 
16         void show() const;//输出结果
17         
18          void add(const Complex &a){
19              real+=a.real;
20              imag+=a.imag;
21          }
22          
23          //友元函数
24          friend bool is_equal(const Complex &c1,const Complex &c2);//判断是否相同 
25          friend Complex add(const Complex &c1,const Complex &c2);//两个复数相加
26          friend double abs(const Complex &c1);//取模        
27 };
28 
29 double Complex::get_real() const{
30 return real;
31 }
32 double Complex::get_imag() const{
33 return imag;
34 }
35 void Complex::show() const{
36     if(real!=0){
37         if(imag>0)
38             cout<<real<<"+"<<imag<<"i";
39             else if(imag==0) 
40             cout<<real<<endl;
41             else
42             cout<<real<<imag<<"i";
43     }
44     else if(imag!=0){
45         if(imag>0)
46             cout<<real<<"+"<<imag<<"i";
47             else if(imag==0) 
48             cout<<real<<endl;
49             else
50             cout<<real<<imag<<"i";
51     }
52     }
53 
54 bool is_equal(const Complex &c1,const Complex &c2){
55     if(c1.real==c2.real&&c1.imag==c2.imag)
56     return true;
57     else 
58     return false;
59 }
60 
61 Complex add(const Complex &c1,const Complex &c2){
62     Complex c3;
63     c3.real=c1.real+c2.real;
64     c3.imag=c1.imag+c2.imag;
65     return c3;
66 }
67 
68 double abs(const Complex &c1){
69     return sqrt(c1.real*c1.real+c1.imag*c1.imag);
70 }

task.cpp

#include "Complex.hpp"
#include <iostream>

int main()
{
    using namespace std;

    Complex c1(3,2);
    const Complex c2(5.4);
    Complex c3(c1);

    cout << "c1 = ";
    c1.show();
    cout << endl;

    cout << "c2 = ";
    c2.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;

    c1.add(c2);
    cout << "c1 += c2, " << "c1 = ";
    c1.show();
    cout << endl;
    getchar();
}

原数据运行结果和更换数据测试结果如下

 

 Task 4 User.hpp

#include<iostream>
#include<string>
using namespace std;

class User{
private:
    string name,password,email;
    static int n;
public:
    User(string na,string p="111111",string e=""):name(na),password(p),email(e){
        n++;}
    User(){n++;};
        
    void set_email();//s设置邮箱 
    void change_password();//修改密码 
    void print_info();//输出结果 
    static void print_n();
};
int User::n=0;//类外成员初始化 

void User::set_email(){
    cout<<"Enter email address: ";
    cin>>email;
    cout<<"Email is set successfully...";
}//设置邮箱 

void User::change_password(){
    cout<<"Enter old password: ";
    string t0,t1;
    int num=0;
    for(int i=1;i<=3;i++){   //不超过三次 
        cin>>t0;
        if(t0==password)
        {
            cout<<"Enter new password: ";
            cin>>t1;
            cout<<"new password is set successfully..."<<endl;
            return;
        }
        else if(i<=2&&t0!=password){
            cout<<"password input error. Please re-enter again: ";
        }
        else 
            cout<<"Password input error.Please try after a while."<<endl;
    }
}//重设密码 

void User::print_info(){
    cout<<"name: "<<name<<endl;
    cout<<"password: ******"<<endl;
    cout<<"email: "<<email<<endl;
}
void User::print_n(){
    cout<<"There are "<<n<<" users."<<endl;
}

task4.cpp

#include "User.hpp"
#include <iostream>

int main()
{
    using namespace std;

    cout << "testing 1......" << endl;
    User user1("sss", "020320", "sssz@hotmail.com");
    user1.print_info();

    cout << endl
         << "testing 2......" << endl
         << endl;
    User user2("xiaoming");
    user2.change_password();
    user2.set_email();
    user2.print_info();

    User::print_n();
}