How do I use CAS variables in a Program?

[John@Mazes.com]

I want to use long integer values in a program. On the CAS home screen, I can define:

* A:=1000!;

and it stores the exact value into that variable.

I've tried methods I saw on various web pages, like

* calling the variables CAS.B and CAS.D
* CAS.B:=19^C-1;

**** (I still got scientific notation when the numbers got too large)

when that didn't work, I tried

* CAS("B:=19^C-1");

**** but this still gave me scientific notation after a certain point.

I'd love to know how to use CAS precision variables in a program if anyone can point me to the information.

Here's the latest version of the program. It is meant to simply give the 2^E and 3^F prime factors of 19^C-1.

Code:


#cas
P18NSUB1():=
BEGIN  
  FOR C FROM 1 TO 15 DO  
  CAS("B:=19^C-1"); 
  CAS("D:=B"); 
  E:=0; 
  F:=0; 
  G:=0; 
  WHILE G = 0 DO 
    CAS("G:=D MOD 2"); 
    IF G = 0 THEN  
      E:=E+1; 
      D:=D/2  END ; 
   END;; 
  G:=0; 
  WHILE G = 0 DO 
    CAS("G:=D MOD 3"); 
    IF G = 0 THEN  
      F:=F+1; 
      D:=D/3  END ; 
   END;; 
  PRINT(1000*E+F+C/1000); 
  PRINT(B); 
  PRINT(-D); 
  END;;  
  RETURN(B);  
END;
#end

(I don't know why this COPY of the program gets double ;; when I only used single ;. I assume there are some places where the ; is optional that I used it, so it was doubled when transferred to the computer. There are also some cases where I have ; in the calcuator and it was deleted when copied to the computer, like in both IF ... END blocks.)