Crystal Reports Basic If statement with Variable

Message

   Hello,
I'm currently trying to create a report for out machine shop that will let them know the % of late and on time work orders.  The fallowing if statement is what I have come up with.

numberVar A :=0 ;
numberVar B :=0 ;
if {WOL_WorkOrderHistoryHeader.ClosedDate} <= {WOL_WorkOrderHistoryHeader.WODueDate} then A = A+1
else 
if {WOL_WorkOrderHistoryHeader.ClosedDate} > {WOL_WorkOrderHistoryHeader.WODueDate} then B = B+1;
B/A

I put this in the detail line and the only output im getting back for A and B is a 0.
Im very new to crystal but have a small amount of programming background. Thanks for the help ahead of time!