把缓冲区与流相联

[c]代码库

#include <stdio.h> 

/* BUFSIZ is defined in stdio.h */ 
char outbuf[BUFSIZ]; 

int main(void) 
{ 
   /* attach a buffer to the standard output stream */ 
   setbuf(stdout, outbuf); 

   /* put some characters into the buffer */ 
   puts("This is a test of buffered output.\n\n"); 
   puts("This output will go into outbuf\n"); 
   puts("and won't appear until the buffer\n"); 
   puts("fills up or we flush the stream.\n"); 

   /* flush the output buffer */ 
   fflush(stdout); 

   return 0; 
}