Mega Code Archive

Xor - boolean xor or bitwise xor of two arguments

1 Boolean expression Xor Boolean expression 2 Integer expression Xor Integer expression Description The Xor keyword is used in two different ways: 1. To perform a logical or boolean 'Exclusive-or' of two logical values. If they are different, then the result is true. 2. To perform a mathematical 'Exclusive-or' of two integers. The result is a bitwise 'Exclusive-or' of the two numbers. For example: 10110001 Xor 01100110 = 11010111 Notes If the boolean expression is calculated (as opposed to being a Boolean variable), then brackets are required to isolate it. Related commands And Boolean and or bitwise and of two arguments Not Boolean Not or bitwise not of one arguments Or Boolean or or bitwise or of two arguments Example code : Illustrate both types of Xor usage var num1, num2, num3 : Integer; letter : Char; begin num1 := $25; // Binary value : 0010 0101 $25 num2 := $32; // Binary value : 0011 0010 $32 // XOr'ed value : 0001 0111 = $17 letter := 'G'; // And used to return a Boolean value if (num1 > 0) Xor (letter = 'G') then ShowMessage('Only one of the values is true') else ShowMessage('Both values are true or false'); // And used to perform a mathematical Xor operation num3 := num1 Xor num2; // Display the result ShowMessageFmt('$25 Xor $32 = $%x',[num3]); end; Show full unit code Both values are true or false $25 Xor $32 = $17