Enumerator Operators

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Listing 7.5 showed how to apply the operators assignment (=), equals (==), and increment (++) to enumerators. Numerous other operators can be used with enumerators; they are listed in Table 7.4.

Table 7.4. Operators Applicable to Enumerators

Binary	+, -
Unary	++, --, ~
Comparison operators	==, !=, <, >, <=, >=
Logical	&, |, ^
Assignment	=, +=, -=
Primary	sizeof

You have not met all of the symbols displayed in Table 7.4. The operators relevant to enumerators are included here for completeness and overview; they will be discussed in relation to enumerators in due time.

The binary operators + and - cannot be applied to two enumerator types. Instead, they are meant to combine one enumerator operand with one integer value operand, such as the following:

 currentDay = currentDay + 1; 

This statement is equivalent to

 currentDay++; 

The binary operators (+) and (-) do not look for the next enumerator in the list (just like the increment and decrement operators). They only add or subtract the integer value from the value the enumerator represents.

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