As an extension to Standard Pascal, Irie Pascal supports the xor operator, which when used with operands of boolean type performs boolean XOR. The result of the operation is of boolean type, and is equal to true if one but not both operands are true, and false if both operands are false, or both operands are true.
false xor false results in false
false xor true results in true
true xor false results in true
true xor true results in false