Why won't my macro variable resolve?

问题:

I have a macro variable, &myvar, but it won\'t resolve when I try to put it in a data step variable. Why won\'t it, and what can I do to fix this?

%let myvar=Hello, world;
data _null_;
  x=\'&myvar.\';
  put x=;
run;

回答1:

Macro variables in SAS won\'t resolve when they are in single quotes, \'&myvar\'. They need to be in double quotes, \"&myvar\", in order to resolve properly.

If you need to have single quotes and a resolved macro variable, you have a few options, but the simplest is:

%str(%\'&myvar.%\')

The %\' inside of %str will place a single quote character (or apostrophe) in the text string by itself without causing it to be quoted.

data _null_;
  x=\"%str(%\'&myvar.%\')\";
  put x=;
run;

or

%let myvar2 = %str(%\'&myvar.%\');