Question

could some one help me understadn wt exactly is a enum ?

Answer 1

enum is the keyword for enumerations. An enum is a declaration of named constants with (default) values starting at 0 and increasing. The default values can be overridden by assigning a value to the name. Here are a couple of enums from one of my assignments:

// enumerate these to make the code read better
enum { X, Y };
enum { A, B, C };

X & A would be 0, Y & B would be 1 and C would be 2.

Answer 2

In C/C++, enum is a compound data type that you can use to ensure that in some places of your code there will be possibility to use only earlier defined set of value names; this allows to improve readability (using names instead of numbers) as well as code control.