Commit 6a686933 authored by Hans Buchmann's avatar Hans Buchmann

other as pointer

parent 49f35bdd
......@@ -15,7 +15,7 @@ class Point
//non default constructor
Point(const Point& other); //copy constructor
~Point(); //destructor no parameters
double distance(Point other);
double distance(Point* other); //other is a pointer
static double distance(Point p,Point q);
private:
......@@ -50,11 +50,15 @@ double Point::distance(Point p,Point q) //is not a member of Point
// |private
}
double Point::distance(Point other) //is a member of Point
double Point::distance(Point* other) //is a member of Point
{
return std::hypot(xc-other.xc,
yc-other.yc);
} //destructor of other
return std::hypot(xc-(*other).xc, //deref with *
yc- other->yc); //deref with ->
/* other notation
return std::hypot(xc-other->xc,
yc-other->yc);
*/
}
//---------------------------------------------- Line
......@@ -76,8 +80,19 @@ destructor of Point 6,8 other
d=5
destructor of Point 6,8 q
destructor of Point 3,4 p
*/
/* with other as pointer
constructor of Point 3,4 p
constructor of Point 6,8 q
d=5
destructor of Point 6,8 q
destructor of Point 3,4 p
*/
int main(int argc,char**args)
{
Point p(3,4);
......@@ -85,7 +100,7 @@ int main(int argc,char**args)
/*
distance (3,4) -> (6,8) = sqrt(3*3+4*4)=sqrt(25)=5
*/
auto d1=p.distance(q);
auto d1=p.distance(&q); //address of q *no* copy
std::cout<<"d="<<d1<<"\n";
return 0;
}
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