Why a do loop index is great than a counter within do loop

[sukannya1]

The following SAS program is submitted:

data WORK.LOOP;

X = 0;

do Index = 1 to 5 by 2;

X = Index;

end;

run;

how the answer is coming x=5 and Index=7? can anybody explain me what is happening step by step?

[tlnarayana26]

Hi 

Here  you we assigned X=0 and index=1  

it increments 1 ,3 ,5 and 7 . In index=5 condition is true then X is 5

and again do loop by 2 value is added (index=7) and condition is falls 

so X=5 and index=7  

[RW9]

The loop is incremented at the end of the loop.  Hence when the end is hit index gets 2 added to it, but as that is greater than 5 it does not loop back to the do part.

[ballardw]

Perhaps if you look at the resulting data set done this way it will help.

This creates an output record for each time the loop executes.

data WORK.LOOP;
   X = 0;
  do Index = 1 to 5 by 2;
     X = Index;
      output;
   end;

run;