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Focal Point    Focal Point Forums  Hop To Forum Categories  WebFOCUS/FOCUS Forum on Focal Point     [CLOSED] Why does '0' equal ' ' ?

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[CLOSED] Why does '0' equal ' ' ?
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Mighty Max
Guru
posted
Ran into something that looks strange to me. Why is the value of &INPUT_TEXT1 'All' it should be '0'. '0' is not equal to ' '.
I am running this fex on 7.7.03.

  
-SET &ECHO = 'ALL' ;

-SET &INPUT1 = '0';
-SET &INPUT1_TEXT = IF '&INPUT1.EVAL' EQ ' ' THEN 'All' ELSE '&INPUT1.EVAL';
-TYPE &INPUT1_TEXT
-EXIT



  
-SET &ECHO = 'ALL' ;

-SET &INPUT1 = '1';
-SET &INPUT1_TEXT = IF '&INPUT1.EVAL' EQ ' ' THEN 'All' ELSE '&INPUT1.EVAL';
-TYPE &INPUT1_TEXT
-EXIT

This message has been edited. Last edited by: Mighty Max,


WebFOCUS 8.1.05M Unix Self-Service/MRE/Report Caster - Outputs Excel, PDF, HTML, Flat Files
 
Posts: 320 | Location: Memphis, TN | Registered: February 12, 2008Report This Post
Waz
Expert
posted Hide Post
This is a long known fact.

The way to distinguish between '0' and ' ', is to use the ASIS function.


Waz...

Prod:WebFOCUS 7.6.10/8.1.04Upgrade:WebFOCUS 8.2.07OS:LinuxOutputs:HTML, PDF, Excel, PPT
In Focus since 1984
Pity the lost knowledge of an old programmer!

 
Posts: 6347 | Location: 33°49'23.0"S, 151°11'41.0"E | Registered: October 31, 2006Report This Post
Mighty Max
Guru
posted Hide Post
Sigh... Yet another gotcha I have to remember to look out for. Thanks for the info Waz.


WebFOCUS 8.1.05M Unix Self-Service/MRE/Report Caster - Outputs Excel, PDF, HTML, Flat Files
 
Posts: 320 | Location: Memphis, TN | Registered: February 12, 2008Report This Post
j.gross
Virtuoso
posted Hide Post
There seem to be two keys to this puzzle. Recall that amper variables are typeless, and are stored as character strings -- so, when comparing amper vars in a dialog manager -IF or -SET command, Focus needs to decide whether to perform a numeric or character comparison.

1. When comparing values, if one of the values resolves to a string that "looks like" a number, Focus performs a numeric (rather than character-string) comparison, and converts the other string value into a numeric value. (If the other value cannot be cast as a number, you get an error message.)

2. Dialog Manager regards a blank string as convertible to zero.
 
Posts: 1925 | Location: NYC | In FOCUS since 1983 | Registered: January 11, 2005Report This Post
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