一个关于array的小问题

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93. This question will ask you to provide a line of missing code.
Given the following data set WORK.SALES:
SalesID SalesJan FebSales MarchAmt
------- -------- -------- --------
W6790 50 400 350
W7693 25 100 125
W1387 . 300 250
The following SAS program is submitted:
data WORK.QTR1;
set WORK.SALES;
array month{3} SalesJan FebSales MarchAmt;
<insert code here>
run;
Which statement should be inserted to produce the following output?
SalesID SalesJan FebSales MarchAmt Qtr1
------- -------- -------- -------- ----
W6790 50 400 350 800
W7693 25 100 125  250
W1387 . 300 250 550
A.Qtr1 = sum(of month{_ALL_});
B. Qtr1 = month{1} + month{2} + month{3};
C. Qtr1 = sum(of month{*});
D.Qtr1 = sum(of month{3});
Answer: C

请问下大家，为什么用C不用D？ 我选的D。
谢谢大家！

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关键词：array ARR Ray 小问题 following following question produce provide should

outside of ARRAY statement, month{3} is temp var which always refers to the 3rd var (i.e. "MarchAmt" here). So, D is not right answer.

goldbaodi 发表于 2015-2-27 00:04
outside of ARRAY statement, month{3} is temp var which always refers to the 3rd var (i.e. "MarchAmt" ...

谢谢！明白了！

求问，为什么A选项不对呢？