reporting services - How to use Floor/Ceiling in a ReportModel expression field? -

I am working in a SSR 2005 Report Model Project I want to create an expression field on a ReportModel which is similar to this C # method:

  Private Static IntervalValnetworkTwitter 0 (double delta) {return (int (delta)? Math: Roof (Delta): Math. Floor (Delta)); }  

I tried to do this:

  IF (delta> 0, terrace (delta), bottom (delta))  

But it seems that ReportModel expressions do not support ceiling or floor functions. Is there any way to do this?

Update : Due to changing the requirements for adding additional complexities in this report, I am going to start with the Report Designer in Visual Studio. So I should be able to use Math.Ciling () and Math.Floor () in the field of an expression on the report.

This is actually supported. Use the following expression:

  = IIF (delta> 0, roof (delta), bottom (delta))