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Unquoting in SAS

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Unquoting in SAS

Hello Forum,

Use of %unquote is not  necessary even though it is quoted with %str in code below (Automatic unquoting).  I wonder under which conditions %unquote is explicitly required to get the resolved value back.

Thanks !!!

options symbolgen;

%let macvar=%str(proc print;runSmiley Wink;

%put &macvar;

SYMBOLGEN:  Macro variable MACVAR resolves to proc print;run;

SYMBOLGEN:  Some characters in the above value which were subject to macro

            quoting have been unquoted for printing.

proc print;run;


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‎08-19-2015 11:28 AM
Super User
Posts: 11,343

Re: Unquoting in SAS

Posted in reply to kaushal2040

Basically needed when you had to %quote (or other functions) because the string you are manipulating has special characters such as % or & that are not macro function or variables (at least at that point in the program) that you do not want resolved.

From the documentation see the difference in these two data steps:

%let val = aaa;

%let testval = %str(%'&val%');

data _null_;

  val = &testval;

  put 'VAL =' val;

run;

and

data _null_;

  val = %unquote(&testval);

  put 'VAL =' val;

run;

I try to avoid macro quoting as much as practical as it often means I've complicated issues somewhere along the line.

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‎08-19-2015 11:28 AM
Super User
Posts: 11,343

Re: Unquoting in SAS

Posted in reply to kaushal2040

Basically needed when you had to %quote (or other functions) because the string you are manipulating has special characters such as % or & that are not macro function or variables (at least at that point in the program) that you do not want resolved.

From the documentation see the difference in these two data steps:

%let val = aaa;

%let testval = %str(%'&val%');

data _null_;

  val = &testval;

  put 'VAL =' val;

run;

and

data _null_;

  val = %unquote(&testval);

  put 'VAL =' val;

run;

I try to avoid macro quoting as much as practical as it often means I've complicated issues somewhere along the line.

Contributor
Posts: 50

Re: Unquoting in SAS

Thanks, ballardw.

This example explains a lot.  I understand when there are macro triggers masked in macro variable then %unquote is required to get resolved value.

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