c++day2

#include <iostream>

using namespace std;

class Rect
{
    int width;
    int height;
public:
    void init(int w,int h);
    void set_w(int w);
    void set_h(int h);
    void show();
};
void Rect::init(int w,int h)
{
    this->width = w;
    this->height = h;
}
void Rect::set_w(int w)
{
     this->width = w;
}
void Rect::set_h(int h)
{
     this->height = h;
}
void Rect::show()
{
    cout << "周长为 " << width*2+height*2 << endl;
    cout << "面积为 " << width*height << endl;
}
int main()
{
    Rect s1;
    s1.init(1,2);
    s1.set_w(2);
    s1.set_h(4);
    s1.show();
    return 0;
}