To perform logical transformations of boolean data, you may use the - following boolean operators: + following logical operators:
on init
@@ -971,10 +971,37 @@
end on
- Remember that with boolean operations, all integer values other than 0
+ Keep in mind that with logical operators shown above,
+ all integer values other than 0
are interpreted as boolean true while an integer value of
precisely 0 is interpreted of being boolean false.
+ So the logical operators shown above always look at numbers at a whole. + Sometimes however you might rather need to process numbers bit by bit. For + that purpose the following bitwise operators exist. +
+
+on init
+ message("1 .and. 1 is " & 1 .and. 1) { bitwise "and" }
+ message("1 .and. 0 is " & 1 .and. 0) { bitwise "and" }
+ message("1 .or. 1 is " & 1 .or. 1) { bitwise "or" }
+ message("1 .or. 0 is " & 1 .or. 0) { bitwise "or" }
+ message(".not. 1 is " & .not. 1) { bitwise "not" }
+ message(".not. 0 is " & .not. 0) { bitwise "not" }
+end on
+
+
+ Bitwise operators work essentially like logical operators, with the
+ difference that bitwise operators compare each bit independently.
+ So a bitwise .and. operator for instance takes the 1st bit
+ of the left hand's side value, the 1st bit of the right hand's side value,
+ compares the two bits logically and then stores that result as 1st bit of
+ the final result value, then it takes the 2nd bit of the left hand's side value
+ and the 2nd bit of the right hand's side value, compares those two bits logically
+ and then stores that result as 2nd bit of the final result value, and so on.
+