C++ char数组转word类型

#define Word2Chars(n,p) {\
    (p)[0]=(unsigned char)(((n)>>8)&0xff);\
    (p)[1]=(unsigned char)( (n)&0xff);\
}
#define Chars2Word(n,p) {\
    n= (((unsigned char)((p)[0])) << 8) + \
       (((unsigned char)((p)[1]))     ) ; \
}