'#' in Gcc

Mar022009
KARPAR

#define __A(v) abcd#v
#define __B(v) abcd##v
#define __C(v) v##abcd
这三个区别是:
__A(test1)展开后变成: abcd "test1" (加双引号并插入空格)
__B(test2)展开后变成: abcdtest2
__C(test3)展开后变成: test3abcd

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