And
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Boolean operation
And produces a value of true if and only if both of its operands are true.
Truth table
A | B | A and B |
---|---|---|
false | false | false |
false | true | false |
true | false | false |
true | true | true |
Bitwise operation
Bitwise and sets a bit to 1 if and only if all of the corresponding bits in its operands are 1.
Is power of two
<delphi> function IsPowerOfTwo( const aValue : longint ): boolean; var
x : longint; b : boolean;
begin
b := false; if aValue <> 0 then begin x := aValue - 1; x := x and aValue; if x = 0 then b := true; end; result := b;
end; </delphi>
If you call IsPowerOfTwo(4) then get true. If you call IsPowerOfTwo(5) then get false .