RE: [Hardhats-members] M statements

[Holloway, Thomas (EDS)]

Usha,      M is very strict about interpreting logic sequences and about evaluating each separate element and operator.  In your first statement M does something like this:   $L(X) is 6, is 6 greater than 30?  No, so that evaluates False or 0.  Now OR that with $L(X) which is 6, giving 0 OR 6.  0 is False, 6 is True, so result is True or 1.  Now is 1 less than 6?  Yes, so whole logic equation evaluates as True and we Write "Done.       The solution to making it perform as intended is to use parentheses:   >S X="0115LV" I ($L(X)>30)!($L(X)<6) W "DONE"      For the sake of pure logic, you don't need the parentheses around $L(X)>30 but using them helps clarify the intent to the next programmer that reads it.      tjh From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Usha Sent: Tuesday, October 25, 2005 7:25 AM To: hardhats-members@lists.sourceforge.net Subject: [Hardhats-members] M statements Hi   Just wondering what brings in the difference in output of the following statements   EHR 3f0>S X="0115LV" I $L(X)>30!$L(X)<6 W "DONE" DONE EHR 3f0>S X="0115LV" I $L(X)<6!$L(X)>30 W "DONE"   EHR 3f0>   Why does the respond in the way it is?   Usha