Difference between revisions of "Not"
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* [[Shortint]] | * [[Shortint]] | ||
* [[Shl#Clear_a_bit| Clear_a_bit]] (bitwise example) | * [[Shl#Clear_a_bit| Clear_a_bit]] (bitwise example) | ||
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| + | [[Category:Pascal]] | ||
Revision as of 19:14, 30 September 2013
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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 ).
