Vector2D.h 
Vector2D.cc           :  a 2D vector with sum and multiplication by a number
                         plus a transformation with 2 different factors
Vector3D.h
Vector3D.cc           :  a 3D vector as a 2D vector plus a z coordinate
                         plus a transformation with 3 different factors
testVector3D.cc       :  create, transform and print a 3D vector

to compile:
c++ -Wall -o testVector3D      testVector3D.cc      Vector2D.cc Vector3D.cc
