XOR

XOR yields TRUE if at least one value is TRUE:

• TRUE xor TRUE = FALSE
• TRUE xor FALSE = TRUE
• FALSE xor TRUE = TRUE
• FALSE xor FALSE = FALSE

// The statement is executed only if exacty one condition is true:

   if (A = 1) XOR (B = 2) then writeln('Bingo!');

Source: Reserved Words

See Also:

not, and, or.