Resolve Macro Variable which is argument of a Macro Function

[arnouxvr]

I have been struggling with an issue.

Looking at the code below:

%put %scan(%str(arg1=A,arg2=B,arg3=C),1);

%let string = arg1=A,arg2=B,arg3=C;

%put %scan(%str(&string),1);

The first %put statement writes arg1=A in the log as expected.

The second %put statement gives a warning.

WARNING: Argument 2 to macro function %SCAN is out of range.

My question is:

How do I force the %put statement to first resolve the macro variable &string to arg1=A,arg2=B,arg3=C and then execute the %put statement?

[kiranv_ · Accepted solution]

this should work as 

The %STR and %NRSTR functions mask a character string during compilation of a macro or macro language statement. They mask the following special characters and mnemonic operators:

to make it work  during execution use %bquote

%put %scan(%str(arg1=A,arg2=B,arg3=C),1);
/*complilation*/
%let string = %str(arg1=A,arg2=B,arg3=C);
%put %scan(&string,1);
/*bquote During execution*/
%let string9 = arg1=A,arg2=B,arg3=C;
%put %scan(%bquote(&string9),1);