[日記] rec

[a2364983 (可憐的小孩)]

#include <iostream>
using namespace std;

class Rectangle
{
public:
        Rectangle();
        float perimeter();
        float area();
        void set();
        void get();

private:
        float length,width;
};

Rectangle::Rectangle()
{
        length=1.0;
        width=1.0;
};

float Rectangle::perimeter()
{
        return 2*(length+width);
};

float Rectangle::area()
{
        return length*width;
}

void Rectangle::set()
{
     do{
        cout << "Please input length:";
        cin >> length;
        cout << "Please input width:";
        cin >> width;
     }while(length >= 20.0 || width >= 20.0 || length <= 0.0 || width <= 0.0);
};

void Rectangle::get()
{
        cout << "length:" << length << endl;
        cout << "width:" << width << endl;
};

int main ()
{
        Rectangle r;
        r.set();
        r.get();

        cout << "perimeter:" << r.perimeter() << endl;
        cout << "area:" << r.area() << endl;

        cout << endl;

        system("pause");
        return 0;
}

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