Back to Reserved words.

The xor operator compares two boolean values, and returns true if and only if one of them is true.

Boolean operation

Exclusive or (xor) results in a value of true if and only if exactly one of the operands has a value of true.

Truth table

Bitwise operation

Bitwise xor sets the bit to 1 where the corresponding bits in its operands are different, and to 0 if they are the same.

Example:

    0101'1010
xor 0011'0100
―――――――――――――
    0110'1110

Toggle a bit

function ToggleBit(const AValue,ABitNumber:integer):integer;
begin
   result := AValue xor 1 shl ABitNumber;
end;

If you call ToggleBit(11,0) then get 10. If you call ToggleBit(10,2) then get 14.

• XOR swap
• Const
• Function
• Integer

From the Free Pascal wiki, page "Xor", as it stood on 2021-09-01 after a change by Mozi, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.