实验一（类与对象）

Complex.hpp

#include<iostream>
#include<cmath>
using namespace std;
class Complex {
public:
    Complex(double r = 0.0, double i = 0.0) :real(r), imag(i) {}
    Complex(const Complex& p) { real = p.real;imag = p.imag; }
    double get_real() const{ return real; }
    double get_imag() const{ return imag; }
    void show() const;
    void add(const Complex &p);
    friend Complex add(Complex p, Complex q);
    friend bool is_equal(const Complex &p, const Complex &q);
    friend double abs(Complex p);

private:
    double real, imag;
};

void Complex::show() const {
    if (get_imag() > 0)
        cout << get_real() << '+' << get_imag() << 'i';
    else if (get_imag() == 0)
        cout << get_real();
    else
        cout << get_real() << get_imag() << 'i';
}

void Complex::add(const Complex &p){
    real += p.get_real();
    imag += p.get_imag();
}

Complex add(Complex p, Complex q) {
    Complex T;
    T.real = p.real + q.real;
    T.imag = p.imag + q.imag;
    return T;
}

bool is_equal(const Complex &p, const Complex &q) {
    if (p.get_real() == q.get_real() && p.get_imag() == q.get_imag())
        return true;
    else
        return false;
}

double abs(Complex p) {
    return sqrt(p.real*p.real+p.imag*p.imag);
}

task3.cpp

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

int main()
{
    using namespace std;

    Complex c1(-3, -4);
    const Complex c2(1.5);
    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;
}

User.hpp

#include<iostream>
#include<string.h>
using namespace std;
class User {
public:
    User(string mingzi, string mima = "111111", string youjian = "") :name(mingzi), passward(mima), email(youjian) { ++n; }
    void set_email();
    void change_passward();
    void print_info();
    static void print_n() { cout <<"There are "<< n<<" users"<<endl; }
private:
    string name;
    string passward;
    string email;
    static int n;
};
int User::n = 0;
void User::set_email() {
    cout << "Enter email address:" ;
    cin >> email;
    cout << "email is set successfully..." << endl;;
}

void User::change_passward() {
    string mima;
    cout << "Enter old passward:" ;
    int i;
    for (i = 0;i < 3;i++)
    {
        cin >> mima;
        if (mima == passward) {
            cout << "Enter new passward:";
            cin >> passward;
            cout << "Newpassward is set succesfully..." << endl;
            break;
        }
        else if (mima != passward && i <= 1) {
            cout << "passward input error,please enter again:";
        }
        else
            cout << "passward input error,please try after a while." << endl;
    }
}

void User::print_info() {
    cout << "name:" << name << endl;
    cout << "passward:"<<"******" << endl;
    cout << "email:" << email << endl;
}

task4,cpp

#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_passward();
    user2.set_email();
    user2.print_info();
    User::print_n();
}

 

 

实验总结：

重载报错没有合适的复制构造函数：在复制构造函数作为参数传进去的对象前加const