一道与预处理有关的题目

在看雪看到了刘涛涛出的一道题：http://bbs.pediy.com/showthread.php?t=130889

过去曾经做过类似的，这里再给个解释的资料：

The # operator has a similar difficulty, by the way. If #x appears in a replacement list, where x is a macro parameter, the corresponding argument is not expanded. Thus, if N is a macro representing 10, and STR(x) has the replacement list #x, expanding STR(N) yields "N", not "10".

这样你就知道TEXT Macro为什么要这样#define了。