Question 4 :

 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?

1. 4
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 Ans : 4

 Exp : Please note the difference between do while and do until:

 DO WHILE

 The while test is evaluated at the top of the loop.

 DO UNTIL

 The until test is evaluated at the bottom of the loop.

 DO WHILE (evaluates at the top of the loop) Now, calls=6 is equal to 6 therefore calls le 6 is TRUE. DO LOOP is executed. So, calls = calls +1 = 7

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