In chapter 2, the book discusses about Enumeration type.

The following code declare the 'week' enumeration type
enum Week : char{ Monday=’M’, Tuesday=’T’, Wednesday=’W’,
Thursday=’T’, Friday=’F’, Saturday=’S’, Sunday=’S’};

How do you refer to Saturday instead of Sunday in your code ? Please note that Saturday and Sunday denote 'S'.

Does this provide the answer?

From page 62:

'enum Week : char{ Monday=’M’, Tuesday=’T’, Wednesday=’W’,Thursday=’T’, Friday=’F’, Saturday=’S’, Sunday=’S’};

Now the values for the constants reflect a little more what they represent, although they do not distinguish between Thursday and Tuesday or between Saturday and Sunday. There is no problem with having duplicate values for the constants, but of course, all the names must be unique.'

Thanks for your reply but it doesnt answer my question. My question is how do you distinguish between Saturday and Sunday because they have same value 'S' ? Demonstrative codes are welcomed.

Try EX2_14 on page 109. While it uses Clubs, Diamonds, Hearts and Spades, it will show you the difference between the names of the constants and their values. Look also at page 111.