SAS base 123中 73、76题疑问

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两个题目都是有关变量长度的问题
QUESTION 73
The following SAS program is submitted:
data work.test;
First = 'Ipswich, England';
City_Country= substr(First,1,7)!!', '!!'England';
run;
Which one of the following is the length of the variable CITY_COUNTRY in the
output data set?
A. 6
B. 7
C. 17
D. 25
Answer: D

QUESTION 76
The following SAS program is submitted:
data work.test;
Author = 'Agatha Christie';
First = substr(scan(author,1,' ,'),1,1);
run;
Which one of the following is the length of the variable FIRST in the output data
set?
A. 1
B. 6
C. 15
D. 200
Answer: D
没太搞明白，哪位大侠给解释下。

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关键词：SAS base Base following question Variable

来自SAS help：
If the SUBSTR function returns a value to a variable that has not yet been assigned a length, by default the variable length is determined by the length of the first argument.

变量first的长度是16，后面连接的总长度是9.

wwang111 发表于 2014-1-21 15:31
来自SAS help：
If the SUBSTR function returns a value to a variable that has not yet been assigned  ...

前边first变量长度好像是15吧@

木颜夕 发表于 2014-1-21 15:45
前边first变量长度好像是15吧@

逗号和e之间有一个空格

wwang111 发表于 2014-1-21 15:47
逗号和e之间有一个空格

能帮忙解释一下76吗，谢啦

木颜夕 发表于 2014-1-21 15:52
能帮忙解释一下76吗，谢啦

SAS help：If the SCAN function returns a value to a variable that has not yet been assigned a length, by default the variable is assigned a length of 200.

学习了

学习了

求问为什么有那个空格？另一题FA1就没有

wwang111 发表于 2014-1-21 15:58
SAS help：If the SCAN function returns a value to a variable that has not yet been assigned a leng ...

为什么照着代码打 运行后first的长度是15求大神解答