Get "de-string" an expression

[Angus]

Code:


EXPORT INT_HEX(X)
BEGIN
  LOCAL str;
  CASE
    IF TYPE(X)==0 THEN R→B(X,32,4); END;
    IF TYPE(X)==1 THEN SETBASE(X,Base); END; //Base is already set to 3
    IF TYPE(X)==2 THEN str:="#"+X+"h";  INT_HEX( CAS(str)); END; //input String like "AA" should return #AAh
    DEFAULT "";
   END;
 // R→B(X,32,4);
END;

That works. But I do not understand what CAS() is doing to integers.