Difference between revisions of "And"
From Free Pascal wiki
Jump to navigationJump to searchm (Text replace - "delphi>" to "syntaxhighlight>") |
(wikitable) |
||
Line 7: | Line 7: | ||
== Truth table == | == Truth table == | ||
− | {| | + | {| class="wikitable" |
|- | |- | ||
− | ! | + | ! A !! B !! A and B |
|- | |- | ||
| false || false | | false || false |
Revision as of 22:39, 4 May 2012
│
Deutsch (de) │
English (en) │
español (es) │
suomi (fi) │
français (fr) │
русский (ru) │
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
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;
If you call IsPowerOfTwo(4) then get true. If you call IsPowerOfTwo(5) then get false .