今天,在我的面谈中,约谈者询问:印刷是一种功能,每个功能回报是某种;固定、无效、浮动等等。 现在,当它发挥职能时,回报是多少?
int. On success, the total number of characters written is returned.
On failure, a negative number is returned.
并非所有职能回报都是通过使用<> 避免<>/代码>表示的:
void function_returns_nothing(void);
<>代码>f是一种功能(在<stdio.h>上公布),并填上了
http://tinyurl.com/29z5ma6“rel=“nofollow noreferer” MSDN:
如果发生错误,应退还印制的品号或负值。
补充对其他细微答案的详细修改:
<代码>f功能回归特性transmitted,或如果出现产出或编码错误,则负值。 C11dr §7.21.6.3 3(我的强调)
关于成功,发送<>。 <><>tdout通常是缓冲<>/strong>的,因此,特性 印有<>的>/em>可能无法实现或到以后失效。
由于各种原因,<编码>印本(<>>>>>)出现故障时,该编号为负数。 姓名:
如果出现以下成功的<代码>fflush(stdout),那么
int transmitted = printf(......);
int flush_retval = fflush(stdout);
int number_certainly_printed = -1; // Unknown
if (transmitted >= 0 && flush_retval == 0) {
number_certainly_printed = transmitted;
}
Note that "printing" a
typically flushes stdout, but even that action is not specified.
What are the rules of automatic flushing stdout buffer in C?
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