SAS Macro : Count number of variables assigned in a macro variable

Suppose you need to identify the number of variables user input in a macro variable.

Option I 
%macro nvars (ivars);
%let n=%sysfunc(countw(&ivars));
%put &n;
%nvars (X1 X2 X3 X4);
Option II 
%macro nvars (ivars);

%let n=1;
%do %until ( %scan(&ivars,&n)= );
%let n=%EVAL(&n + 1);

%let n=%eval(&n-1);
%put &n;

%nvars ( X1 X2 X3 X4);
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Deepanshu founded ListenData with a simple objective - Make analytics easy to understand and follow. He has over 8 years of experience in data science. During his tenure, he has worked with global clients in various domains like Banking, Insurance, Telecom and Human Resource.

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