实验任务五

#include<iostream>
#include<iomanip>
using namespace std;
class Rectangle
{
public:
    Rectangle(double length = 2.0, double width = 1.0);
    Rectangle(const Rectangle& obj);
    ~Rectangle() = default;
    double len()const;
    double wide()const;
    double area()const;
    double circumference()const;
    void resize(double times);
    void resize(double times, double w_times);
private:
    double _length;
    double _width;
};

Rectangle::Rectangle(double length, double width)
{
    _length = length;
    _width = width;
}

Rectangle::Rectangle(const Rectangle& obj)
{
    _length = obj._length;
    _width = obj._width;
}

double Rectangle::len()const
{
    return _length;
}

double Rectangle::wide()const
{
    return _width;
}

double Rectangle::area()const
{
    return _length * _width;
}

double Rectangle::circumference()const
{
    return _length * 2 + _width * 2;
}
void Rectangle::resize(double times)
{
    _length *=times;
    _width *=times;
}

void Rectangle::resize(double times, double w_times)
{
    _length*=times;
    _width *=w_times;
}

void output(const Rectangle& rect)
{
    cout << "矩形信息:\n";
    cout << fixed << setprecision(2);
    cout << "长：    " << rect.len() << endl;
    cout << "宽：    " << rect.wide() << endl;
    cout << "面积：  " << rect.area() << endl;
    cout << "周长：  " << rect.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);
    system("pause");
    return 0;
}