not point method distance

acesses private parts

6-cia/src/geo2d-bb.cc

@@ -32,66 +32,22 @@ Point::~Point()
 }
 
 /*
-{
- {
-  Point p(1,1);
- }
- Point q(2,2);
- Point r(3,3);
-}
-constructor Point 1,1
-destructor Point 1,1
-constructor Point 2,2
-constructor Point 3,3
-destructor Point 3,3
-destructor Point 2,2
-
-*/
-
-/*
-{
- {
-  Point p(1,1);
-  {
-   Point q(2,2);
-   {
-    Point r(3,3);
-   }
-  }
-}
-
-constructor Point 1,1
-constructor Point 2,2
-constructor Point 3,3
-destructor Point 3,3
-destructor Point 2,2
-destructor Point 1,1
-
+geo2d-bb.cc:36:22: error: double Point::xc is private within this context
 */
-
-/*
+// distance not in class Point
+double distance(Point p,Point q)
 {
- Point p(1,1); //instance of class Point defined and initalized constructor
- Point q(2,2);
- Point r(3,3);
+ return std::hypot(q.xc-p.xc,q.yc-p.yc); //<---- error
+                 //  |----|----|----|----------------private
 }
-constructor Point 1,1
-constructor Point 2,2
-constructor Point 3,3
-destructor Point 3,3
-destructor Point 2,2
-destructor Point 1,1
 
-*/
 //---------------------------  use case
 int main(int argc,char** args)
 {
-  Point p(1,1);   //constructor p
-  {
-   Point q(2,2);  //constructor q
-   {
-    Point r(3,3); //constructor r
-   } //destructor r
-  }//destructor q
+ Point p(5, 7);
+ Point q(8,11);
+//distance p -> q sqrt(3*3 + 4*4)=sqrt(25)=5
+ auto d=distance(p,q);
+ std::cout<<"d="<<d<<"\n"; 
  return 0;
-} //destructor p
+}