complex condition question.. 1

[nxm150]

Is the following

IF FIELD-1 NOT = 'AB' AND 'CD'

the same as

IF FIELD-1 NOT = 'AB' AND NOT = 'CD'

 

[fredericofonseca]

why don't you write a small program and try it?

Regards

Frederico Fonseca
SysSoft Integrated Ltd

http://www.syssoft-int.com

 

[k5tm]

You are asking if two abbreviated relational conditions are the same.

The effect of using such abbreviations is as if the last preceding stated subject were inserted in place of the omitted subject, and the last stated relational operator were inserted in place of the omitted relational operator.

The interpretation applied to the use of the word NOT in an abbreviated combined relation condition is:[ul square][li]If the word immediately following NOT is GREATER, >, LESS, <, EQUAL or =, the NOT participates as part of the relational operator.[/li][li]In all other circumstances, the NOT is interpreted as a logical operator and, therefore, the implied insertion of subject or relational operator results in a negated relation condition.[/li][/ul]

Since the word that follows NOT is =, the omitted relational operator is NOT =.

The non-abbreviated equivalent of

IF  FIELD-1 NOT = 'AB' AND 'CD'

is

IF  FIELD-1 NOT = 'AB' AND FIELD-1 NOT = 'CD'

because the omitted subject is FIELD-1 and the omitted relational operator is NOT =.

The non-abbreviated equivalent of

IF  FIELD-1 NOT = 'AB' AND NOT = 'CD'

is

IF  FIELD-1 NOT = 'AB' AND FIELD-1 NOT = 'CD'

because the omitted subject is FIELD-1 and the omitted relational operator is NOT =.

They look the same to me.

Tom Morrison

http://www.liant.com

 

[k5tm]

Minor oops in the last post, but the point is valid...

Tom Morrison

http://www.liant.com

 

[jleites]

The short answer is Yes. I always wright it the first way.

 

[MarcLodge]

I always use the long hand approach of
IF FIELD-1 NOT = 'AB'
AND FIELD-1 NOT = 'CD'

It takes not too many jots longer to code, and leaves no room for confusion.

Marc

 

[grande]

I agree with MarcLodge. It's a lot easier to understand, especially for people with backgrounds in other languages (ie, Me), where it would make a difference.

-------------------------
Just call me Captain Awesome.

 

[3gm]

This is one of those "religious" topics

Other approaches I've seen (and I'll let you be the judge):

IF  NOT (FIELD-1 = 'AB' OR 'CD' ) 
   ...
END-IF

or

IF FIELD1 = 'AB' OR 'CD'
    CONTINUE
ELSE 
    ...
END-IF

or even

EVALUATE FIELD1
    WHEN 'AB'
    WHEN 'CD'
        CONTINUE
    WHEN OTHER
      ...
END-EVALUATE

Most folks I've talked with hate NOT logic and wouldn't recognize DeMorgan's Theorem if it bit them in the tush, so I suspect Option 2 would be most "popular", at least of these three.

GlennM (in deference to Glenn9999)

 

[nxm150]

Thank you for the replies. Does anyone have a link (for documentation) to the above question.

 

[k5tm]

Sure, you can go to the Liant web site, click on Product Documentation, and download the Language Reference Manual in PDF form. Search for the word 'abbreviated' and you should find it pretty easily.

Tom Morrison

http://www.liant.com