topic ERROR MESSAGE IN SCRIPTING in Libraries & objects

ERROR MESSAGE IN SCRIPTING

Anonymous — Tue, 15 Aug 2006 07:23:48 GMT

I HAVE BEEN GETTING A COMMON ERROR MESSAGE WHEN CHECKING SCRIPT

SEEMS TO BE A THE POINT OF USING A IF THEN ELSE STATEMENT

' USE OF REAL TYPES CAN RESULT IN PRECISION PROBLEMS AT LINE XX OF FILE XXXXXX'

I THINK I HAVE ONLY HAD THIS MESSAGE SINCE MOVING TO AC 9

Re: ERROR MESSAGE IN SCRIPTING

Anonymous — Tue, 15 Aug 2006 07:50:01 GMT

This annoying message started appearing somewhere between 8.0 and 8.1 as I recall. It is alerting you to a potential problem. The trouble is that it usually is not an actual problem.

The warning is generated when you use a conditional statement (IF, WHILE, REPEAT) with a precise value for a real number as the condition. Such as:

IF x = 0 THEN...

rather than:

IF x > -0.0001 AND x < 0.0001...

As I understand it the actual problems arise when "x" is the result of a calculation, since rounding errors can produce very small inaccuracies which will prevent it from exactly equalling the desired value even though it should.

The trouble is that I (and many others I am sure) often use a named parameter as the condition with a VALUES statement to limit it to the precise values used in the conditional statements. This precludes any actual errors but still generates the pesky warning.

BTW, turn off your caps lock. It's not polite to shout 😉

Re: ERROR MESSAGE IN SCRIPTING

Frank Beister — Tue, 15 Aug 2006 08:37:33 GMT

Have a look to this thread:
Use of real types
and this:
Use of real types can result in precision problems