实验1 类与对象

task3

Complex.hpp源码

#include<iostream>
#include<cmath>

using namespace std;

class Complex
{
    public:
    Complex(float newReal,float newImag);
    Complex();
    Complex(float newReal);
    Complex(const Complex &p);
    float get_real()const;
    float get_imag()const;
    void show() const;
    void add(Complex p);
    friend Complex add(Complex p1,Complex p2);
    friend bool is_equal(Complex p1,Complex p2);
    friend float abs(Complex &p);

    private:
    float real,imag;
};

Complex::Complex(float newReal,float newImag):real(newReal),imag(newImag){}
Complex::Complex():real(0),imag(0){}
Complex::Complex(float newReal):real(newReal),imag(0){}
Complex::Complex(const Complex &p){
    real=p.real;
    imag=p.imag;
}
float Complex::get_real()const{
    return real;
}
float Complex::get_imag()const{
    return imag;
}
void Complex::show()const{
    cout<<real;
    if(imag<0){
        cout<<" - "<<-imag<<"i";
    }
    else if(imag>0){
        cout<<"+"<<imag<<"i";
    }
    
}
void Complex::add(Complex p){
    real=real+p.real;
    imag=imag+p.imag;
}
Complex add(Complex p1,Complex p2){
    Complex c;
    c.real=p1.real+p2.real;
    c.imag=p1.imag+p2.imag;
    return c;
}
bool is_equal(Complex p1,Complex p2){
    if(p1.real==p2.real && p1.imag==p2.imag) return true;
    else return false;
}
float abs(Complex &p){
    float temp1,temp2;
    temp1=p.real*p.real+p.imag*p.imag;
    temp2=sqrt(temp1);
    return temp2;
}

task3.cpp源码

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

int main()
{
    using namespace std;

    Complex c1(3, -4);
    const Complex c2(4.5);
    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;
}

task3.cpp对应结果截图

 新实验数据源码

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

int main()
{
    using namespace std;

    Complex c1(6, -2);
    const Complex c2(9);
    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;
}

新实验数据对应结果截图

task4

User.hpp源码

#include<iostream>
#include<string.h>

using namespace std;


class User{
    public:
    User(string newName);
    User(string newName ,string newPassWord, string newEmail);
    void set_email();
    void change_passwd();
    void print_info();
    static void print_n();
    private:
    string name;
    string passwd;
    string email;
    static int count;
};
int User::count=0;

User::User(string newName):name(newName){
    ++count;
    passwd="111111";
    email="";
}
User::User(string newName ,string newPassWord, string newEmail):name(newName),passwd(newPassWord),email(newEmail){
    ++count;
}

void User::set_email(){
    cout<<"Enter email address:";
    cin>>email;
    cout<<"email is set successfully..."<<endl;
    
}

void User::change_passwd(){
    int newwd,i;
    string testwd;
    cout<<"Enter old password:";
    cin>>testwd;
    for(i=0;i<2;){
    if(testwd==passwd){
        cout<<"Enter new passwd:";
        cin>>newwd;
        passwd=newwd;
        cout<<"new passwd is successfully..."<<endl;
        break;
    }else{
        cout << "password input error.Please re-enter again:";
        cin>>testwd;
        i++;
    }
    if(i==2) cout<<"password input error. Please try after a while."<<endl;
    
}
}
void User::print_info(){
    cout<<"name:"<<name<<endl;
    cout<<"passwd: ******"<<endl;
    cout<<"email:"<<email<<endl;
}

void User::print_n(){
    if(count==1) cout<<"there is 1 user";
    else cout<<"there are " <<count<<" users";
}

task4.cpp源码

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

int main()
{
    using namespace std;

    cout << "testing 1......" << endl;
    User user1("Jonny", "92197", "xyz@hotmail.com");
    user1.print_info();

    cout << endl
         << "testing 2......" << endl
         << endl;
    User user2("Leonard");
    user2.change_passwd();
    user2.set_email();
    user2.print_info();

    User::print_n();
}

task4.cpp对应结果截图

 新实验数据源码

int main()
{
    using namespace std;

    cout << "testing 1......" << endl;
    User user1("陈超凡", "020220", "nmsl@hotmail.com");
    user1.print_info();

    cout << endl
         << "testing 2......" << endl
         << endl;
    User user2("朱辰逸");
    user2.change_passwd();
    user2.set_email();
    user2.print_info();

   

新实验数据实验结果截图

实验总结：

1.注意const的用法和他对引用&的影响

2.注意接口的定义和实现是否满足对应实验要求