#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;
}
原文：http://www.cnblogs.com/aicpcode/p/4264797.html