Why the do group is processing even if the condition is not satisfied?

[devarayalu]

Can any one help in this?

data one;

input a b;

datalines;

1 2

2 3

3 4

;

run;

data two;

chk=open('one');

chk1=varnum(chk, 'LINENO');

if chk1 ne 0 then do;

set one;

if LINENO ne 1;

end;

run;

Here the Do group is getting processed and giving note in the log that "Variable LINENO is uninitialised"

Thank you in adnvance.

[Tom]

SAS compiles the whole data step. So even though the line that references the variable LINENO is inside of a DO loop that will never execute SAS will still create the variable in the program data vector.  Hence the warning about the variable never being initialized.

[devarayalu]

ok thank you and can you please also guide me how to get rid of the message. without changing the if condition

[Haikuo · Accepted solution]

data _null_;

chk=open('one');

chk1=varnum(chk, 'LINENO');

if chk1 ne 0 then call execute(' data two; set one; if lineno ne 1; run;');

run;

[devarayalu]

Thank you so much for the prompt answer