how to combine 2 different variables

[noway320]

Hello all,

I need some help about combining two variables like,
zipcode will be P_zip+P_zip4 (Here P_zip and P_zip4 are 2 different variables containing null values too.)

So, zipcode will be P_zip+P_zip4 and separated by hyphen.
e.g.
1)P_zip = 1233 P_zip4= 1563
zipcode = 1233-1563

2)P_zip = 1233 P_zip4=
zipcode = 1233-
3)P_zip = P_zip4= 1563
zipcode = -1563
4) P_zip = P_zip4=
zipcode = -

Thanks in advance.

 

[noway320]

We can use CATX function.