EQV Operator
 
Syntax
  result = numeric-expression1 EQV numeric-expression2
 
Use the logical-equivalence operator to compare corresponding bits in
numeric-expression1 and numeric-expression2, and then set the corresponding
bit in the result according to the following table:
 
Bit in First Expression   Bit in Second Expression   Bit in Result
       1                         1                          1
       1                         0                          0
       0                         1                          0
       0                         0                          1