思维导图：

 

 

#include <iostream>
using namespace std;
class Rect
{
private:
    int width;
    int height;
public:
    void init(int w,int h)
    {
        width=w;
        height=h;
    }
    void set_w(int w)
    {
        width=w;
    }
    void set_h(int h)
    {
        height=h;
    }
    void show()
    {
        cout << "perimeter = " << (2*width+2*height) << endl;
        cout << "area = " << width*height << endl;
    }
};
int main()
{
    Rect rect;
    rect.init(1,1);
    rect.set_h(4);
    rect.set_w(5);
    rect.show();
    return 0;
}