[noob][c++] class declaration.

this is from

http://www.cplusplus.com/doc/tutorial/classes.html

what is this?

CRectangle (int,int);







// example: class constructor
#include <iostream>
using namespace std;

class CRectangle
{
      int width;
      int height;
      
      public:
            CRectangle (int,int);
            int area ()
            {
                  return (width*height);
                  
            }
}

;

CRectangle::CRectangle (int a, int b)
{
      width = a;
      height = b;
}


int main ()
{
      CRectangle rect (3,4);
      CRectangle rectb (5,6);
      cout << "rect area: " << rect.area() << endl;
      cout << "rectb area: " << rectb.area() << endl;
      return 0;
}