macro-if in stop statement of macro-do-loop

[Quodly]

%macro a(condition);
  %do i = 1 %to %if &condition. %then 2; %else 3;;
    %put &i.;
  %end;
%mend;

ERROR: There is no matching %IF statement for the %ELSE.
ERROR: A dummy macro will be compiled.

what is the problem?

%macro b(condition);
  %do i = 1 %to %sysfunc(ifn(&condition., 2, 3));
    %put &i.;
  %end;
%mend;

%b(0);
%b(1);

%b(0);
1
2
3
%b(1);
1
2

this seem to work, though.

[PaigeMiller · Accepted solution]

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ERROR: There is no matching %IF statement for the %ELSE.

%IF is in a location in a %DO statement where it is not allowed.

ERROR: A dummy macro will be compiled.

You macro named %A has not been compiled and so cannot be used.

This, however, would work, as now the %IF is in a position where it is recognized. (Your %b is another way to make this work)

%macro a(condition);
    %if &condition. %then %let endvalue = 2; 
    %else %let endvalue=3;
    %do i = 1 %to &endvalue;
        %put &i.;
    %end;
%mend;

%a(0)
%a(1)