sas - what the last "." after the macro variable mean -


below code create dataset exisitng datasets, end , end8, end7 macro variables, wondering why add . @ end of macro variables?

data tab4a_&end.; set  mck_tab4a_&end8. mck_raw.mck_tab4a_&end7. run;

the dot marks end of macro variable. used when macro text combined static text, e.g. in filename, sas knows macro variable ends. e.g.:

%let year=2017;  %let filename = &year._accounts.xlsx;  %put &filename;

produces 2017_accounts.xlsx

without first dot, sas produce warning message, because looking macro variable called year_accounts. (it can't tell macro ends , text starts).

if there space or end of statement after macro variable dot can omitted. including dot has no effect in case. people think include dot.


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