What is the functionality of || here

[bncoxuk]

%macro break(byval);
  data work.age_&byval;
    set work.sorted(where=(age=&byval));
  run;
%mend;
proc sort data=sashelp.class out=work.sorted;
  by age;
run;
options mprint;
data _null_;
  set work.sorted;
  by age;
  if first.age then call execute('%break('||age||')');
run;

[art297]

concatenation

[bncoxuk]

Sorry I don't understand why there is concatenation here. The files are produced as age_11, age_12...

[art297]

It is concatenating the string that is being sent.  In short, it is submitting:

%break(16)

which will run the macro with the variable's value

[bncoxuk]

Can I ask how '||age||' became the value of the variable?

Thanks for help.

[art297 · Accepted solution]

Take a look at: http://support.sas.com/documentation/cdl/en/mcrolref/61885/HTML/default/viewer.htm#a000543697.htm