下面的程序的运行结果为什么是这样呢？求大神知道！
#include<stdio.h>
#define FORMAT "%s ! c is cool \n!"
int main(void）
{
  printf(FORMAT,FORMAT);
  return 0;
}
运行结果：
%s !c is cool!
! c is cool!

printf (FORMAT,FORMAT);等于
printf ( "%s! C is cool!\n", "%s! C is cool!\n");
然后将第一个%s用"%s! C is cool!\n"代替，也就是打印
%s! C is cool!\n! C is cool!\n，即：
%s! C is cool!
! c is cool!