3

#include <iostream>
using namespace std;
class Rectgangle{
	private:
		int length;
		int width;
	public:
		void js(int l,int w){		
			length=l;
			width=w;
		}
		void sj(){
			cout<<"周长是："<<(length+width)*2<<endl;
			cout<<"面积是："<<length*width;
		}		
};
int main(){
	Rectgangle a;
	a.js(10,20);
	a.sj(); 
	return 0;
}