If a running total is null then how to show 0.00?

Hi, I'm using Crystal Reports 8.5 and I have this issue:
I have a numeric running total field which is evaluated using a formula.
If no records satisfy that formula then the running total field becomes empty, but, instead of showing nothing (empty) I would like to show 0.00
How can I do this?

Thanks in advance

PS: I use visual basic 6.0 and reports are .rpt files outside of the .exe file.Ok, I solved it. I used a formula field which evaluates the running total, and I put the formula instead the running total on the report.|||How did you do that, Thanks.|||Create a formula having the code

If {RunningTotalField} is null then
0
else
{RunningTotalField}

IDIOT NEEDS HELP comparing a variable against a list

I have a variable called @.ORComm which has been selected using a cursor from each line on an order.

DECLARE TC2 CURSOR FOR
SELECT [Commodity],[Total] FROM [CSITSS].[dbo].[Ordrate] WHERE [OrderNumber]= @.OrdNum AND [Companydiv] = 'GLPC-TRANS'
OPEN TC2
FETCH NEXT FROM TC2 INTO @.ORComm, @.ORTotal

I need to compare the resulting @.ORComm against a list of valid commodity types selectable by

SELECT [CommodityClass] FROM [CSITSS].[dbo].[Comclass] WHERE [CompanyDiv] = 'GLPC-TRANS' AND [DELETED] = 0

What's the easiest way to do this?SELECT [CommodityClass] FROM [CSITSS].[dbo].[Comclass] WHERE [CompanyDiv] = 'GLPC-TRANS' AND [DELETED] = 0 and CommodityClass=@.ORComm

??|||I feel stupid I didn't think of that. I was thinking of storing the selected values in an array but that is much simpler.