C++构造函数

#include<iostream.h>
class rectangel{

public:
	rectangel(int l,int w){
	
		length = l;
	
		width = w;
	
	}

	int area();
	
	
	


private :
	int length;
	int width;

};
int rectangel::area(){

	return length* width;
}

int main()
{

	rectangel a(3,4);
	cout<<"长方形面积："<<a.area()<<endl;


	return 0;
}