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Here's an interesting one I did not know.

In an RPGLE program I have a character field, defined as

d TDESC1              s                 40a

then an IF statement:

IF %TRIM(TDESC1) <> *ZEROS;

If TDESC1 is all blanks, is the above statement true or false?

I would have thought an empty string, i.e. a varying length field with current length zero, would not be equal to zero, but when I debugged the program, it turns out it is.

I'm not sure whether it's converting the empty string to a numeric value, or considering the *ZEROS as a varying length field too, and therefore comparing an empty string to an empty string.  Either way, it was not what I expected.  Live and learn!

--
*Peter Dow* /
Dow Software Services, Inc.
909 793-9050
petercdow@xxxxxxxxx <mailto:petercdow@xxxxxxxxx>
pdow@xxxxxxxxxxxxxx <mailto:pdow@xxxxxxxxxxxxxx> /

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