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Sunday, January 24, 2010

Base 32

The following SAS program is submitted:


data work.clients;
calls = 6;
do while (calls le 6);
    calls + 1;
end;
run;


Which one of the following is the value of the variable CALLS in the output data set?
A. 4
B. 5
C. 6
D. 7

4 comments:

SASGuru said...

Answer D.
Calls advances to 7 then stops in the do while loop

kat said...

do you not have to put
calls = calls + 1?

To Fu said...

@kat: you may write calls = calls + 1. I believe that is called an assignment statement in SAS. One downside of assignement statement is that it does not ignore missing values. However, you can solve it by adding a RETAIN statement.

By writing calls +1 as shown above, it is called SUM statement. It ignores the missing values.

Pavan Kumar said...

@FU:
Even though if we use RETAIN stmt and missing value is there in input values, then also it shows the result until the missing value obs comes, hence for proper result direct arithmetic operation performed.

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