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| #warning Header file pic18f452.h included directly. Use #include <htc.h> instead.调用的头文件中开头为以下代码,不知道什么意思? #ifndef _PIC18F452_H_
 #define _PIC18F452_H_
 
 /*
 * C Header file for the Microchip PIC Microcontroller
 * PIC18F452
 */
 #ifndef _HTC_H_
 #warning Header file pic18f452.h included directly. Use #include <htc.h> instead.
 #endif
 
 求大神解释一下。
 
 
 
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