题目如下
[size=12.000000pt]
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 dataset?
[size=12.000000pt]A. 1 B. 6 C. 15 D. 200
[size=12.000000pt]Answer: D
[size=12.000000pt]

然后我跑了如下的程序：

data test;

Author = 'Agatha Christie';

First = substr(scan(author,1,' ,'),1,1);

run;

proc datasets;

contents data= test;

run;

结果如下

Alphabetic List of Variables and Attributes
#	Variable	Type	Len
1	Author	Char	15
2	First	Char	15

为什么答案说是200？

我不明白。

求解