学步园

此处笔记

宏使用避免命名冲突

例1：
#if  defined (_HP_) || defined (__WIN__) ||defined(__LINUX__)
typedef char				int8;
typedef short				int16;
typedef int					int32;
#endif

例2：
#define __Linux 0xffff

#ifdef __hpux 	
	iconv_t cd = iconv_open("utf8", "hp15CN");
#elif defined _AIX 	
	iconv_t cd=iconv_open("UTF-8","GB18030");
#elif defined __Linux	
  iconv_t cd=iconv_open("UTF-8","GB2312");
#endif 	

	if (cd == (iconv_t)-1) xxxxx;