Hi:
Partly the answer depends on what you want to do with ID and whether ID is character or numeric. If ID is numeric, then SAS will not -store- leading zeroes -- however, you can -display- leading zeroes by simply using a FORMAT statement (probably best in this case to permanently associate a format with the ID variable).
[pre]format ID z5.;
[/pre]
If you put that format statement in the program where you read the text file (assuming you're using a DATA step program), then SAS would format the ID to be 5 digits, with leading zeroes. So the internally stored number '123' would display on all reports as '00123', for example. If you are importing the data without a DATA step, then you can always modify the format attribute with PROC DATASETS, after the dataset is created.
However, if you read ID as a character variable and then store it as a character variable, SAS will both -store- and -display- the leading zeroes without needing a user defined format.
cynthia
[pre]
data leadzero;
infile datalines;
input name $ as_num_id as_char_id $;
format as_num_id z5.;
return;
datalines;
alan 00123 00123
bob 00234 00234
cathy 00345 00345
dana 00456 00456
;
run;
proc print data=leadzero;
run;
[/pre]
