Difference between revisions of "Not"
From Free Pascal wiki
Jump to navigationJump to search (wikitable) |
m |
||
Line 1: | Line 1: | ||
+ | {{not}} | ||
+ | <br> | ||
+ | <br> | ||
+ | __TOC__ | ||
= Boolean operation = | = Boolean operation = | ||
Revision as of 08:07, 10 July 2013
│
Deutsch (de) │
English (en) │
suomi (fi) │
français (fr) │
русский (ru) │
Boolean operation
Not produces a value of true if original value is false.
Truth table
A | Not A |
---|---|
false | true |
true | false |
Bitwise operation
Bitwise not sets the bit to 1 if corresponding bit is 0, and to 0 if bit is 1.
Ones' complement
function OnesComplement ( const aValue : byte ): byte;
begin
result := Not AValue;
end;
If you call OnesComplement(%10000000) then get %01111111 (%10000000 = 128 and %01111111 = 127). If you call OnesComplement(%00000111) then get 248 (248 = %11111000).
function OnesComplement2 ( const aValue : shortint ): shortint;
begin
result := Not AValue;
end;
If you call OnesComplement2(%00000010) then get %11111101 (%00000010 = 2 and %11111101 = -3 when type is shortint). If you call OnesComplement2(7) then get -8 (-8 = %11111000 when type is shortint and 7 = %00000111 ).