everest% CC cubemain.C cube.C box.C
cubemain.C:
cube.C:
box.C:
everest% 

everest% a.out
Default Box constructor, this = 0xffffffadb0
Default Cube constructor, this = 0xffffffadb0
Default Box constructor, this = 0xffffffadc0
Alternate Cube constructor, this = 0xffffffadc0
Default Box constructor, this = 0xffffffadd0
c1: I'm a cube. Each side has length=1. Serial number = 1
c2: I'm a cube. Each side has length=1.2. Serial number = 2
b: I am a box with length=1, height=2 and width=3.  Serial Number = 3

=== Report:
There are 3 boxes in existence.
A total of 3 boxes have been made.
===


Compare
Cube c1 fits inside cube c2
Box b and cube c1 are incomparable

Grow c1
I'm a cube. Each side has length=2. Serial number = 1
Volume of c1 is now 8

Shrink c2
I'm a cube. Each side has length=0.6. Serial number = 2
Volume of c2 is now 0.216

=== Report:
There are 3 boxes in existence.
A total of 3 boxes have been made.
===

Box destructor, this = 0xffffffadd0
Cube destructor, this = 0xffffffadc0
Box destructor, this = 0xffffffadc0
Cube destructor, this = 0xffffffadb0
Box destructor, this = 0xffffffadb0
everest%