Unary Operators

A unary operator is an operator that operates on a single operand to the right of the operator.

Negation

The unary minus (-) operator negates the value of its operand, effectively changing its sign.

VAR
  a : INT := 5;
END_VAR

print(-a);          // -5

Logical

The NOT operator inverts the boolean value of its operand. If the operand is TRUE, the result is FALSE, and vice versa.

VAR
  a : BOOL := FALSE;      // a begins as FALSE
END_VAR

IF NOT a THEN             // Condition evaluates to TRUE
    a := NOT a;           // The value of a is inverted from FALSE to TRUE
END_IF;

print(a); // TRUE

Bitwise

Inverts each bit of the operand. For any given bit, if it is 0 it becomes 1 and vice versa.

VAR
  a : INT := 2;
END_VAR

printf(a, 'b3');        // 010

a := NOT a;
printf(a, 'b3');        // 101