实验1 类和对象（1）

#include <iostream>
using std::cout;
using std::endl;

class Point {
public:
Point(int x0 = 0, int y0 = 0);
Point(const Point& p);
~Point() = default;

int get_x() const { return x; }
int get_y() const { return y; }
void show() const;
private:
int x, y;

};

Point::Point(int x0, int y0): x{x0}, y{y0} {
cout << "constructor called." << endl;
}
Point::Point(const Point& p):x{p.x},y{p.y}{
cout << "copy constructor called."<<endl;
}
void Point::show() const {
cout << "(" << x << ", "
<< y << ")" << endl;
}
int main(){
Point p1(50,30);
p1.show();

Point p2 = p1;
p2.show();

Point p3{p2};
p3.show();
cout << p3.get_x() << endl;
}

#include <iostream>
#include <iomanip>
using std::cout;
using std::endl;

class Clock {
public:
  Clock(int h = 5, int m = 16, int s = 20);
  Clock(const Clock& t);
  ~Clock() = default;
  void set_time(int h, int m = 0, int s = 0);
  void show_time() const;
private:
  int hour, minute, second;
};
Clock::Clock(int h, int m, int s): hour{h}, minute{m}, second{s} {
  cout << "constructor called" << endl;
}
Clock::Clock(const Clock& t): hour{t.hour}, minute{t.minute},
second{t.second} {
  cout << "copy constructor called" << endl;
}
void Clock::set_time(int h, int m, int s) {
  hour = h;
  minute = m;
  second = s;
}
void Clock::show_time() const {
  using std::setw;
  using std::setfill;
  cout << setfill('0') << setw(2) << hour << ":"
    << setw(2) << minute << ":"
    << setw(2) << second << endl;
}
Clock reset() {
  return Clock(0, 0, 0);
}
int main()
{
  Clock c1(18, 33, 7);   
  c1.show_time();
  c1 = reset();    
  c1.show_time();
  Clock c2(c1);  
  c2.set_time(7);
  c2.show_time();
}

#include <iostream>
using namespace std;
class X{
public:
  X();   
  ~X();  
  X(int m);   
  X(const X& obj);
  X(X&& obj) noexcept;    
  void show() const; 
private:
  int data;
};
X::X(): data{42} {
  cout << "default constructor called.\n";
}
X::~X() {
  cout << "destructor called.\n";
}
X::X(int m): data{m} {
  cout << "constructor called.\n";
}
X::X(const X& obj): data{obj.data} {
  cout << "copy constructor called.\n";
}
X::X(X&& obj) noexcept: data{obj.data} {
  cout << "move constructor called.\n";
}
void X::show() const {
 cout << data << endl;
}

int main(){
    X x1;
    x1.show();
    
    X x2{2049};
    x2.show();
    
    X x3{x1};
    x3.show();
    
    X x4{ move(x2) };
    x4.show();
    
}