SAS Advance 130的81题

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楼主小白，想请教各位巨巨一道题！谢谢啦！
81. at the start of a new SAS session, the following program is submitted:
%macro one;
data_null_;
call symput('proc','means');
run;
proc &proc data=sashelp.class;
run;
%mend;
%one();
答案是the macro variable PROC is stored in the global symbol table，请问为什么不是local symbol table呢？

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关键词：ADVANCE advan VANCE ance Van following local start

自答：应该是l此时ocal symbol table为空，所以存到更外层的global symbol table
Call SYMPUT() 会将创建的宏变量存入到最近的非空的symbol table 中，如果运行到call symput时宏location里已经有了局部宏变量，那call symput创建的宏变量就是local的，否则就会存到更外层。 SAS HELP: "SYMPUT puts the macro variable in the most local nonempty symbol table. A symbol table is nonempty if it contains a value a computed %GOTO (A computed %GOTO contains % or & and resolves to a la ...

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SYMPUT is a SAS language routine that assigns value produced in a data step to a GLOBAL symbolic variable.