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The following SAS program is submitted: %let test = one; %let one = two; %let two =
three; %let three = last; %put what displays is &&&&&test; What is written to the SAS log?
A.what displays is one
B.what displays is two
C.what displays is three
D.what displays is last
Answer: B
为什么？
pobel 发表于 2013-4-30 07:10
宏变量的解析原则：
1. 从左到右，如遇到两个连续的&符号，则解析为一个&符号；
2. 如遇到一个&符号后面连 ...
wangzhuo422 发表于 2013-4-30 20:13
也就是说有两个&就变成一个，一直剩到最后只有一个&？
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