Question

How many times does this DO loop execute?

data test;
x=15;
do until(x>12);
x+1;
end;
run;
a. 0
b. 1
c. 12
d. unknown

Answer 1

The DO loop in question starts with x=15 and is set to execute until x>12, but since x is already greater than 12 at the start, the DO loop will not execute at all.

Step-by-step explanation:

The question refers to a DO loop in a SAS data step. The DO loop begins with an initial value of x=15 and contains a do until condition stating that the loop should continue to execute until x>12. However, since the initial value of x is already greater than 12, the DO loop will not execute even once. Therefore, the answer is a. 0 times.

It is important to note that there is an error in the loop's code, which could lead to confusion. To increment the value of x, the correct code should be x = x + 1 or x + 1;, but given that x starts above 12, the loop still would not execute.