C++ day2

1.xmind
2.

#include <iostream>

using namespace std;

class Rect
{
private:
    int  width;
    int height;
public:
    void init(int width,int height );
    void set_width(int width);
    void set_height(int height);
    void show();
};
void Rect :: init (int width,int height)
{
    this->width=width;
    this->height=height;
}
void Rect :: set_width(int width)
{
    this->width=width;
}
void Rect :: set_height(int height)
{
    this->height=height;
}
void Rect :: show()
{
    cout << "周长： " << 2*height+2*width << "  面积: " << height*width << endl ;
}

int main()
{
    int width = 10;
    int height =10 ;
    Rect r1;
    r1.init(width,height);
    r1.show();

    cout << "please enter width : " ;
    cin >> width ;
    r1.set_width(width);
    cout << "please enter height : ";
    cin >> height;
    r1.set_height(height);
    r1.show();

    return 0;
}