HELP: Null number condition within SWITCH

[Guest]

I have a line of code that checks on a number field and returns a message;
however, I can't get the syntax correct for the null condition.

switch([x:50]>35,"xxx",[x:50]<35,"yyy",????)

what is the correct syntax I need to output a message if [x:50] is null?

 

[Allen Browne]

Use IsNull(), e.g.:
Switch(IsNull([x]), "Nuffin", ...