Scientific notation on macro

[arodriguez]

Hi,

Yesterday, I was programming on macro and I realized that in a macro evaluation 10 is not equal than 1e1, but in a data step it says that they are equal.

%put %eval(10=1e1);
0

data test;
if 10=1e1 then put "1";
run;

1

Why happen this?

[Patrick · Accepted solution]

You need "%sysevalf()". Run the following

data _null_;
var= 10=1e1;
put var=;
run;

%put eval: %eval(10=1e1);
%put sysevalf: %sysevalf(10=1e1);

[Kurt_Bremser]

The macro processor is a pure text engine, so you need to see all comparisons as character comparisons, unless you override that behaviour, as Patrick already pointed out.