Flushing PDV variables

Question

Is there a command or a quick way to set all the existing variables in the PDV to missing?

I have some code which runs like this:

Data example2; 
var1='A';
Var2='B';
Var3='C';
/* etc*/
output;
Var1='B';
output;
stop;
run;

once the first 'output' statement is reached I'd like to reset all the PDV variables to missing (eg var2=''; var3='';) but without having to manually declare them as such. Can anyone help?

Answer 1

The call missing routine and the _all_ automatic variable list will do it easily

call missing(of _all_);

For example

Data example2;
var1='A';
Var2='B';
Var3='C';
output;
call missing(of _all_);
Var1='B';
output;
stop;
run;

proc print data=example2;
run;

produces

                                 The SAS System

                               Obs    var1    Var2    Var3

                                1      A       B       C
                                2      B