C语言中宏使用实例一则 

 1 #include <stdio.h>
 2 #include <stdarg.h>
 3 
 4  #define print_info_1(arg) print_info arg
 5 
 6 void print_info(char* name, const char* format, ...); 
 7 
 8 
 9 #define log_info(level, arg) \
10 print_info_##level(arg)
11 
12 int main()
13 {
14      log_info(1, ("main", "print info:%s\n", "hello!world"));
15 }
16 
17 void print_info(char* name, const char* format, ...)
18 {
19      char buf[50];
20      va_list arg;
21      va_start(arg, format);
22      vsprintf(buf, format, arg);
23     va_end(arg);
24 }

 

posted @ 2010-11-10 22:51  茫茫深海一条鱼  阅读(147)  评论(0)    收藏  举报