特殊的宏定义

/*****************************strcat*****************************************/
/* # 字符串化 */
#define		exp(s)	#s   			// exp(145s)	<==>  "145s" 	

/* ##为连接符，用来将宏参数或其他的串连接起来 */
#define		STR_TO_CAT(a, b)	a##b   		// strcat(a, b)	<==> STR_TO_CAT(a, b) 
#define		CON1(a, b)	a##e##b   			// CON1(2.5, 2)	<==> 2.5e2 == 250 
#define		CON2(a, b)	a##b##00   			// CON2(2.5, 2)	<==> 2.5200

日志的打印等级

/*****************************strcat*****************************************/
#ifndef _DEBUG_H
#define _DEBUG_H

/* 
 *	when PRINTF_LEVEL == 1 
 *	printf("This is a debug information maro!!!");	<==>	LOG("This is a debug information maro!!!");
 *	printf("a = %d, b = %f\n", a, b);	<==>	LOG("a = %d, b = %f\n", a, b);
 *
 */

#include <stdio.h>

/*****************************SelfPrintf***********************************************/
#define PRINTF_LEVEL 0

#if (PRINTF_LEVEL == 0)
#define	 LOG(...)	printf("COMMON_DEBUG ======= :"__VA_ARGS__)
#define  LOG_ERROR(err_msg)		\
	do { \
		printf("COMMON_DEBUG_ERROR=======: %s:%s:%d", __FILE__, __FUNCTION__, __LINE__);  \
		printf(" (err_msg:%s)\n", err_msg);
	} while(0) \	

#elif (PRINTF_LEVEL == 1)
#define	 LOG(...)	printf(__VA_ARGS__)
#define  LOG_ERROR(err_msg)		\
	do { \
		printf("ERROR=======: %s:%s:%d", __FILE__, __FUNCTION__, __LINE__);  \
		printf(" (err_msg:%s)\n", err_msg);
	} while(0) \

#else
#define LOG(...) do {} while(0)
#define LOG_ERROR(err_msg) do {} while(0)
#endif


#endif