写法一:
%macro f1;
%put this is f1;
%macro f2;
%put this is f2;
%macro f3;
%put this is f3;
%mend f3;
%f3;
%mend f2;
%f2;
%mend f1;
%f1;
写法二:
%macro f3;
%put this is f3;
%mend f3;
%macro f2;
%put this is f2;
%f3;
%mend f2;
%macro f1;
%put this is f1;
%f2;
%mend f1;
%f1;
请问哪种写法规范些?



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