SAS base 123中 73、76题疑问

学习了！感谢~

解释的很好！

uuuuueeeee 发表于 2015-1-22 10:25
求问为什么有那个空格？另一题FA1就没有

结果里面是没有空格的，字符长度是25，因为first是16，substr截取了部分，但不能改变first的长度，这题和72题要一起看

fainy荧 发表于 2015-8-11 12:20
为什么照着代码打 运行后first的长度是15求大神解答

因为SAS 9.4之后scan function default length 定义变了，具体参照这里：
http://support.sas.com/documentation/cdl/en/lefunctionsref/69762/HTML/default/viewer.htm#p0jshdjy2z9zdzn1h7k90u99lyq6.htm
In a DATA step, if the SCAN function returns a value to a variable that has not yet been given a length, that variable is given the length of the first argument. This behavior is different from the behavior in previous releases of SAS. In previous releases, code that created a variable with a length of 200 might have produced a variable with a length that was greater than expected. If you need the SCAN function to assign a variable with a value that is different from the length of the first argument, use a LENGTH statement.