C++ imposes
fairly strict rules on how you can name your
variables:
nvariable names must begin with a letter
nvariable names are "case-sensitive" (i.e., the variable "myNumber" is different from the variable "MYNUMBER" which is different from the
variable "mYnUmBeR")
nvariable names can't have spaces
nvariable names can't have special characters (typographic symbols, such as &, %, $, £ etc.)
Variables type
nA variable type is a description of
the kind of information a variable will store.