Supplementary Lessons

There are a number of additional lessons that should be covered after variables are mastered. Some have to do with variables and others not. Here are your choices:
a) Named constants
b) Side effect operators
c) Calling functions
d) User interface paradigms
or
x) Exit to the C++ foyer

Links:
Constants Revisited
Side Effects
Enhancing operators with functions
User Interface Paradigms
C++ foyer