QT day 2

#include 
 
using namespace std;
class rect
{
private:
    int width;
    int height;
public:
    void init(int width , int height);
    void set_w(int width);
    void set_h(int height);
    void show();
};
void rect::show()
{
    int c= (width + height) *2 ;
    int s=width * height;
    cout << c<< " ";
    cout << s<< endl;
}
void rect::init(int width, int height)
{
    this -> width=width;
    this -> height=height;
}
void rect::set_w(int width)
{
    this -> width=width;
}
void rect :: set_h(int height)
{
    this -> height=height;
}
 
int main()
{
    rect rec;
    rec. init (3,4);
    rec.show();
    rec.set_w(7);
    rec.show();
    rec.set_h(10);
    rec.show();
 
    return 0;
}