PPL programming question; local variables

[CR Haeger]

Hello,

Thanks to HAN for preparing this excellent guide: http://www.hpmuseum.org/forum/thread-216.html

I'm new at PPL programming and made it through all but the last program. The following code runs fine and is based on Part IV #2 code Han provided.

PHP Code:

// program declarations 
THIRDANG(); 
ANG(); 

// Local variables
LOCAL angle1, angle2; 

// THIRDANG(a,b) // Takes two angles a and b (in radians) of a triangle and // returns the third angle (in degrees) 
EXPORT THIRDANG(a,b) //<-- ** Can I change this to THIRDANG(angle1, angle2)?

BEGIN   
  angle1:=a;   // <-- ** Can I delete this?
  angle2:=b;   // <-- ** Can I delete this?
  IF HAngle==0 THEN
    ANG();
  END;   
  RETURN(180-angle1-angle2); 
END; 

// ANG() // Takes an angle a (in radians) and returns the same angle in degrees 
ANG() 

BEGIN   
  angle1:=angle1/PI*180;   
  angle2:=angle2/PI*180; 
END; 


But, if I try to shorten the code to the following, it appears that the local variables are not passed to the ANG() subroutine when it is called. Why not?

PHP Code:

// program declarations 
THIRDANG(); 
ANG(); 

// Local variables
LOCAL angle1, angle2; 

// THIRDANG(a,b) // Takes two angles a and b (in radians) of a triangle and // returns the third angle (in degrees) 
EXPORT THIRDANG(angle1, angle2) //<--  edited
BEGIN   
     // angle1:=a; <-- Deleted
     // angle2:=b; <-- Deleted
  IF HAngle==0 THEN
    ANG();
  END;   
  RETURN(180-angle1-angle2); 
END; 

// ANG() // Takes an angle a (in radians) and returns the same angle in degrees 
ANG() 

BEGIN   
  angle1:=angle1/PI*180;   
  angle2:=angle2/PI*180; 
END; 


Best,
Carl

** Updated second code...