CMP.EXP

(* @NESTEDCOMMENTS := 'Yes' *)
(* @PATH := '\/Mathematical' *)
(* @OBJECTFLAGS := '0, 8' *)
(* @SYMFILEFLAGS := '2048' *)
FUNCTION CMP : BOOL
VAR_INPUT
	X,Y : REAL;
	N : INT;
END_VAR
VAR
	tmp : REAL;
END_VAR


(*
	version 1.1	10. mar. 2009
	programmer 	hugo
	tested by		tobias

this function checks two inputs x and y if they are identical with the first N digits
example : cmp(3.141516,3.141517,6 is true.

*)
(* @END_DECLARATION := '0' *)
tmp := ABS(x);
IF tmp > 0.0 THEN
	tmp := EXP10(INT_TO_REAL(FLOOR(LOG(tmp))-N+1));
ELSE
	tmp := EXP10(tmp);
END_IF;
CMP := ABS(X - Y) < tmp;


(* revision history
hm	12. mar. 2008	rev 1.0
	original version

hm	10. mar. 2009	rev 1.1
	added type conversion for compatibility reasons
*)


END_FUNCTION