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c++ - sebuf设置缓冲区大小,但并不是按照设定的大小刷新

 #define BUFSIZE 3

int main(){

char c;
static char buf[BUFSIZE];
setbuf(stdout, buf);
while ((c = getchar()) != EOF){
    putchar(c);
   }
}

但是结果并不是像我想象的按照输入三个字符会自动刷新?请问这是什么问题?

怪我咯怪我咯2803 Tage vor555

Antworte allen(2)Ich werde antworten

  • ringa_lee

    ringa_lee2017-04-17 11:10:49

    自己看清楚文档:

    void setbuf(FILE *stream, char *buf);
    ...
    The setbuf() function is exactly equivalent to the call
    
       setvbuf(stream, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
    

    要指定大小,用 setbuffer

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    0
  • PHPz

    PHPz2017-04-17 11:10:49

    $ man setbuf

    The setbuf() function is exactly equivalent to the call

    setvbuf(stream, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
    

    注意最后的 BUFSIZ

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