Answer Posted / nani

%macro add(a,b);
%if (%datatyp(&a)=NUMERIC and %datatyp(&b)=NUMERIC) %then %
do;
%put The result is %sysevalf(&a+&b).;
%end;
%else %do;
%put Error: Addition requires numbers.;
%end;
%mend add;

You can invoke the ADD macro as:

%add(5.1E2,225)

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