Copy portions of column based on other column

[Daisy2]

I have one column (NC) that I want to copy to another new column (NCMeas), but whenever column "Selected" = 0 I want the new column "NCMeas" to be empty.  How do I do that?  These are all numeric columns. Thanks.

data want;
  set have;
  NC = NCMeas;
  if Selected=0 then call NCMeas ????;
run;

[PaigeMiller]

if Selected=0 then call missing(NCMeas);

[Shmuel · Accepted solution]

data want;
  set have;
  NCMeas = NC;
  if Selected=0 then call missing(NCMeas) ;
run;

alternative code:

data want;
  set have;
       if Selected=0 then call missing(NCMeas) ;
       else  NCMeas = NC;
run;