請(qǐng)問(wèn)可以在宏里面定義宏嗎? 如下面這樣,測(cè)試好像沒(méi)有錯(cuò),但不知這樣的寫(xiě)法推不推薦:
寫(xiě)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;
寫(xiě)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;
請(qǐng)問(wèn)哪種寫(xiě)法規(guī)范些?