# 实验一 类与对象（1）

#include<iostream>
using namespace std;

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(1217,1118);
p1.show();

Point p2 = p1;
p2.show();

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

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

class Clock{
public:
Clock(int h = 0,int m = 0,int s = 0);
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 {
cout << setfill('0') << setw(2) << hour << ":" << setw(2) << minute << ":"
<< setw(2) << second << endl;
}
Clock reset() {
return Clock(0, 0, 0);
}

int main()
{
Clock c1(2,12,17);
c1.show_time();

c1 = reset();
c1.show_time();

Clock c2(c1);
c2.set_time(2,11,18);
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} {
std::cout << "default constructor called.\n";
}
X::~X() {
std::cout << "destructor called.\n";
}
X::X(int m): data{m} {
std::cout << "constructor called.\n";
}
X::X(const X& obj): data{obj.data} {
std::cout << "copy constructor called.\n";
}
X::X(X&& obj) noexcept: data{obj.data} {
std::cout << "move constructor called.\n";
}
void X::show() const {
std::cout << data << std::endl;
}
int main()
{
X x1;
x1.show();

X x2{2049};
x2.show();

X x3{x1};
x3.show();

X x4{ std::move(x2) };
x4.show();
}

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

class Rectangle{
public:
Rectangle();
Rectangle(double l,double w);
Rectangle(const Rectangle &rect);
~Rectangle()=default;
double get_len() {return length;}
double get_wide() {return width;}
double area() {return length*width;}
double circumference() {return 2*(length+width);}
double resize(double times) {length=times*length,width=times*width;}
double resize(double l_times,double w_times) { length*=l_times,width*=w_times;}
private:
double length,width;
};
Rectangle::Rectangle(): length{2.0},width{1.0}{}

Rectangle::Rectangle(double l,double w): length{l},width{w}{}

Rectangle::Rectangle(const Rectangle& rect): length{rect.length},width{rect.width}{}

void output(const Rectangle &rect) {
Rectangle a=rect;
cout << "矩形信息: \n";
cout << fixed << setprecision(2);
cout << "长:     " << a.get_len() <<endl
<< "宽:     " << a.get_wide() <<endl
<<"面积:   " << a.area() <<endl
<<"周长:   " << a.circumference() << endl <<endl;

}
int main()
{
Rectangle rect1;
output(rect1);

Rectangle rect2(10, 5);
output(rect2);

Rectangle rect3(rect1);
rect3.resize(2);
output(rect3);

rect3.resize(5, 2);
output(rect3);
}

posted @ 2022-10-03 17:35  lovessr  阅读(5)  评论(0编辑  收藏  举报