do while condition

[BrahmanandaRao]

data dsn2;
set sashelp.class;
n=1;
do while (n<5);
 n+1;	
end;output;
run;

i want below output using do while and do until loops

Name Sex Age Height Weight

Alfred	M	14	69.0	112.5
Alice	F	13	56.5	84.0
Barbara	F	13	65.3	98.0
Carol	F	14	62.8	102.5
Henry	M	14	63.5	102.5

[Tom]

The code you posted is just going to create a new variable named N with the same value on every observation, so the output will look nothing like what you say you want.

Can you describe in words what you want as the output?

Looks like you just want to use one of these data steps instead, none of which need DO WHILE or DO UNTIL.

data want;
  set sashelp.class;
  if _n_<= 5;
run;

data want;
  set sashelp.class;
  if _n_>5 then stop;
run;

data want;
  set sashelp.class (obs=5);
run;

[PaigeMiller]

Generally, DO WHILE is not for selecting rows, or iterating over rows.

data dsn2;
set sashelp.class(obs=5);
run;

or

data dsn2;
     set sashelp.class;
     if _n_<=5;
run;