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CCS宏定义找不到的问题



在A.h里,我定义了

#define   N_PERIOD     200

在B.h文件里,我包含了A.h文件,但编译就是通过不过,错误如下  error #20: identifier "N_PERIOD" is undefined

怎么回事? 是不是文件文件编译有先后顺序?