The following SAS program is submitted:
data work.pieces;
do while (n lt 6);
n + 1;
end;
run;
Which one of the following is the value of the variable N in the output data set?
A. 4
B. 5
C. 6
D. 7
Click Comment link to get answer
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C
ReplyDeleteC
ReplyDeleteANSWER IS C FOR SURE
ReplyDeletehow it is C ? can u expalain?
ReplyDeleteSimilar to last question, DO WHILE (evaluates at the top of the loop). [Remember: SAS gives value starting from 0, if value not defined] n=0, 1, 2, 3, 4, 5 than n is lt (less than) 6 therefore n lt 6 is TRUE. DO LOOP is executed.
DeleteAdding plus 1 at every iteration.
Now, when n=6 at top, it is not less than 6 therefore condition n lt 6 is FALSE. DO LOOP is not executed.
Hence, the value of n remains 6
because of n+1 statement we assume a implicit retain n 0; statment.
ReplyDeleteFirst loop (0 lt 6) => true => n = 1
Second loop (1 lt 6) => true => n= 2
......
last loop (6 lt 6) => false => do while exits and pdv writes 6 as value of n in output dataset. Hopefully that helps.
c carefully.....
ReplyDeleteans is c-6.
data pieces;
do while (n lt 6);
n + 1;
end;
run;
proc print data=pieces;
run;
it will take n as 1 and loop 5 times to get 5 which is less then 6. then add 5+1=6.
put 4 inplace of 1 n c u will get 8 that becose it loops once n give 4 so 4+4 gives 8
put 2 inplace of 1 n c. it will loop twice to give 4 and 4+2 is 6 so ans is 6 .. i am great na...
Folks:
ReplyDeleteIn question (34)
calls= 6;
do while ( call le 6)
calls+1
end;
run;
in Question (35)
do while (n lt 6);
n + 1;
end;
run;
Please someone explain the differences?
in Q 34 , calls= 6 and when it reads calls takes the value 6 and adds 1 gives us the result 7, no more do loops stops there because in next iteration calls will be greater than 6.a Am I correct?
but in Q35 n is not given rather it is in the do loops and reads 5 and adds 1 = 6, next loop it is equal to 6, stops the iteration. VOILA!!!!!!!!,
Please correct me if I am wrong.
lt = "less than"
ReplyDeletele = "less than or equal to"
D
ReplyDeleteB
ReplyDeleteThe ans is 6 (C) in this case. Nice expln given by some one already abt implicit retain as n+1
ReplyDeleteC
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ReplyDeleteตารางคะแนน
All you need to be aware in this case is knowing the following difference:
ReplyDeletelt means 'less than <'
le means 'less or equal to <='
same can be said for > , >=
gt ' greater than'
ge 'greater than or equal to'.
Hope it helps
C
ReplyDelete