benefit of using the const keyword is that the compiler might be
able to make optimizations based on the knowledge that the value of
the variable will not change. In addition, the compiler will try to
ensure that the values wonít be changed inadvertently.
Of course, the same benefits apply to #defined constants. The reason
to use const rather than #define to define a constant is that a
const variable can be of any type (such as a struct, which canít be
represented by a #defined constant).
Also, because a const variable is a real variable, it has an address
that can be used, if needed, and it resides in only one place in