询问关于Length的问题（123题中的题目）！

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对于character variable 来说， the length of a variable always define automatically in the first statement and remain unchanged during the whole program until and unless we redefine it. 按照这个说法，为什么123题中的第64题答案是A不是12。虽然说work department的data set中character variable的length是5，可是在程序中有“length jobcode$ 12”的语句，不就等于重新redefine了吗？那么答案不应该是12吗？

The following SAS DATA step is submitted:
data work.accountting;
set work.department;
length jobcode$ 12;
run;
The WORK.DEPARTMENT SAS data set contains a character variable named
JOBCODE with a length of 5.
Which one of the following is the length of the variable JOBCODE in the output
data set?
A. 5
B. 8
C. 12
D. The length can not be determined as the program fails to execute due to errors.

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关键词：length leng eng Department Determined department character following always during

D 好像定义长度的时候字符型和数值型都只能制定长度，字符型变量不能加$

SAS compiler uses first in first out rule.

set statement is before the length statement. So for any variables defined in a length statement is also on the data set,
1) sas use the length definition on that data set if a variable type is the same
2) issue error message if if a variable type is different.

You can see the difference if you put the length statement before  the set  statement.