How to generate natural numbers in output?

[venkatnaveen]

I want output like

x

1

12

123

1234

1234

I have used ranuni function and do loop .

I am not getting?

[Ksharp]

Is it what you are looking for ?

data _null_;

do i=1 to 20;

a=int(ranuni(-1)*10000);

put i a;

end;

run;

Xia Keshan

[venkatnaveen]

But.xia keshan, I want output like in below format

1

12

123

1234

12345

[Ksharp]

Still hard to know what you are looking for .

data x;
 str='123456789';
 do i=1 to 9;
  num=input(substr(str,1,i),best32.);
  output;
 end;
run;

Xia Keshan