Remove null & empty values

I created a report with multiple fields. I would like to create a generic formula in which it evaluates all the values and if it found a null or empty value it will be replaced by a 'N/A'. I was searching in the forums and I found the following formula
if (isnull() or ( ='')) then
"Display the required text"
else
when I tried to use it i had an error that the value must be boolean. Is there is a way where I can change all the fields as string?? and a assign "N/A"
or
how can I assign a "N/A"to a boolean field??
also I have approx. 140 fields to evaluate, does the formula can be generic or I will need to create a formula for each variable??
thanks

Usually when Crystal runs across a field that is NULL, it immediately stops executing the formula, unless the field is enclosed within IsNull(). However, I'm not sure if that is the case for a parameter being passed to a function. So, you may be able to create a function like (Formula Workshop -> Create Custom Functions -> Add; basic syntax):
function DisplayString (inVal as string) as string
if (isnull(inVal) or (inVal ='')) then
DisplayString = "N/A"
else
DisplayString = inVal
end if
If Crystal does stop when passing a NULL value as a parameter, then you could code a similar function (without the isnull()), and check the Convert NULL Database Values to Default option on the File -> Report Options panel.
You would need to create one such function for each data type that you want to show "N/A" for, and for data types other than string, convert the value to a string when it is not null.
These functions could then be used in the Display String formula for the field on the report.
The only other way I can think of achieving this would be to base the report(s) on an SQL Command and convert NULL values to "N/A" there. It might be a bit easier to do in an SQL Command, but probably not a whole bunch.
Or, educate your users that when nothing is printed, it means that it's not applicable!
HTH,
Carl

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Olaf Helper
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