%macro RRR(N=) OR %macro RRR(N)

[Ronein]

Hello

What is the difference between way1 and way2?

In way1 written %macro RRR(N=);

In way2 written %macro RRR(N);

Is it positional parameters in both ways?

What is thwa way to see in the log the actual code that the  processor see?

/****Way1***/
%macro RRR(N=);
%if &N. > 10 %then %do;
proc means data = sashelp.class MEAN;
var age;
run;
%end;
%else %put No calculation;
%mend;
%RRR(N=19);

/****Way2***/
%macro RRR(N);
%if &N. > 10 %then %do;
proc means data = sashelp.class MEAN;
var age;
run;
%end;
%else %put No calculation;
%mend;
%RRR(N=19);

[japelin]

In way1, you must always write "keyword parameter name & =", but it does not matter if the position is swapped when there are two or more parameters. You can also set an initial value.
In way2, the positional parameter names can be omitted, but if there are two or more parameters, they must be written in the order in which they are defined.

[ChrisNZ]

Is it positional parameters in both ways?

positional parameter means there's no = sign

What is thwa way to see in the log the actual code that the processor see?

See option MPRINT

[Kurt_Bremser]

It is all explained in the documentation:

%MACRO Statement