Math Operators
(  )  *  /  +  -    and logical NOT:  ! 
#declare Result = -0.45*A + (B*B - 4)*C; //
#local Angle_1 = degrees( atan ( 2.5 / sqrt(2)); // angle value in degrees


Relational Operators.
<  <=  =  !=  >=  > 
 #declare Green_or_Red = pigment{ rgb<(clock <= 0.5),(clock > 0.5),0;>,}


Logical Operators
  &  // = AND
  |  // = OR 
  &! // = AND NOT
// Note: The Arguments A and B are not handled bitwise but logical! 
#if (A & B)
  ... // do this if both A and B are true
#end
#if (A | B)
  ... // do this if either A or B is true
#end