SOME HIDE DETAILES OF MACRO IN C--continue

最近在看python源码分析的时候发现，很多C语言的基础知识都已经忘的差不多，因此自己在动手熟悉一把，

#include 
#include 
#include 
#define  DEBUG_H 
#ifdef   DEBUG_H 
#define  xman_info    (printf("my name is%s\nage is %d\naddress is %s\n",man.name,man.age,man.address))
#else 
#define  xman_info    printf("XMAN NOTHING INFO\n")
#endif
/*******************/
#if  1  
#define  xmanp_info    (printf("my name is%s\nage is %d\naddress is %s\n",m->name,m->age,m->address))
#else 
#define  xmanp_info    printf("XMAN NOTHING INFO\n")
#endif
/******************/
typedef struct  {
	char * name;
	int age;
	char * address;
}xman;
int main(int argc,char * argv[]){	
	xman * m;
	xman man = {"kinfinger ",22,"pudong"};  /* struct init*/
	m = &man;
	xman_info;
	xmanp_info;

}

需要说明的是宏的一些细节问题，

#ifdef   DEBUG_H 

#if  1  

一个是根据宏是否定义来进行条件编译，

一个是根据宏常量表达式来进行判断，该宏常量表达式也可以用宏来进行定义

syntax:

# if constant-expression new-line groupopt
# ifdef identifier new-line groupopt
over~~~~~~~~~~~~~~~~~~~~~