05_prototype_fun(class).cpp

//prototype fun(class):

#include<iostream>
using namespace std;
class Rect{
public:
int height;
int width;
int area();
};
int Rect::area(){
return height*width;
}
int main(){
Rect ob1;
ob1.height=5;
ob1.width=3;
cout<<ob1.area();
return 0;
}