add two variables (results is null)

[drousham]

hello ,

I createed two variable , and i create a third one which culculate the sum of the two first variables

so when I do the sum , i have null value a ( because when a field of one variable is null then we can do the sum )

solution please :?

[CaptnTony]

If I'm understanding correctly you're trying to add the values contained in two separate variables (a) and (b) and storing it in a third ©.

 

To do this, I've found that each should be initialized to a value (zero for math) so that it isn't ever null. You cannot add a null to a value as far as I know. So, in the default value expression something like new Integer(0) should do the trick. I'd initialize all values for giggles, but at least a and b.