请教一个关于Macro的题目

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The thing I don't understand is why the marco variable proc is global instead of local to the marco one?

Thanks!

options mprint symbolgen;

mprint symbolgen;

%macro one;

data _null_;

call symput('proc', 'means');

run;

proc &proc data=sashelp.class;

run;

one;

data _null_;

call symput('proc', 'means');

run;

proc &proc data=sashelp.class;

run;

'proc', 'means');

run;

proc &proc data=sashelp.class;

run;

%mend;

%one

;

%one

%put _local_;

_local_;

%put _global_;

_global_;

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关键词：Macro acr CRO Mac Understand 请教 题目 Macro

不知道为什么上面的程序乱了。再贴一下。

options mprint symbolgen;

mprint symbolgen;

%macro one;

data _null_;

call symput('proc', 'means');

run;

proc &proc data=sashelp.class;

run;

one;

data _null_;

call symput('proc', 'means');

run;

proc &proc data=sashelp.class;

run;

'proc', 'means');

run;

proc &proc data=sashelp.class;

run;

%mend;

%one

;

%one

%put _local_;

_local_;

%put _global_;

_global_;

自己想通了。Just the way it is.

The SYMPUT routine and the SYMPUTX routine can only create a local

macro variable if a local symbol table already exists.