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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!
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