strtol问题 [英] strtol question
问题描述
不是：
char s [] =" - 4" ;;
char * endptr;
strtol（s，& endptr，0）;
应该返回0并将endptr设置为s？我已经遇到了一个实现
（不是gcc，gcc做我期望的）返回LONG_MIN !!我害怕
看看它对endptr做了什么:-)
-nrk。
-
删除电子邮件的devnull
Isn''t:
char s[] = "--4";
char *endptr;
strtol(s, &endptr, 0);
supposed to return 0 and set endptr to s? I have run into an implementation
(not gcc, gcc does what I expect) that is returning LONG_MIN!! I am afraid
to see what it did to endptr :-)
-nrk.
--
Remove devnull for email
推荐答案
nrk< ra ********* @ devnull.verizon达网络>写道：
nrk <ra*********@devnull.verizon.net> wrote:
不是：
char s [] =" - 4" ;;
char * endptr;
strtol（s，& endptr，0）;
应该返回0并将endptr设置为s？
是的。
我已经遇到了一个实现
（不是gcc，gcc做我期望的）返回LONG_MIN !!
只有转换后的值_is_为LONG_MIN，或者在
之外，才允许长期和负数的范围。在这种情况下，没有转换的
值，因为两者都没有 - 4。也不是-4以一个整数常量开始。
我害怕看到它对endptr做了什么： - ）
Isn''t:
char s[] = "--4";
char *endptr;
strtol(s, &endptr, 0);
supposed to return 0 and set endptr to s?
Yes.
I have run into an implementation
(not gcc, gcc does what I expect) that is returning LONG_MIN!!
That''s only allowed if the converted value _is_ LONG_MIN, or is outside
the range of long and negative. In this case, there is no converted
value, since neither "--4" nor "-4" starts with an integer constant.
I am afraid to see what it did to endptr :-)
我很好看它做了什么......这是什么实现，顺便说一句？
Richard
I''m _curious_ to see what it did... Which implementation is this, btw?
Richard
" ; NRK" < RA ********* @ devnull.verizon.net>在消息中写道
新闻：iy *************** @ nwrddc03.gnilink.net ...
"nrk" <ra*********@devnull.verizon.net> wrote in message
news:iy***************@nwrddc03.gnilink.net...
不是：
char s [] =" - 4";
char * endptr;
strtol（s，& endptr，0）;
应该返回0并将endptr设置为s？我遇到了返回LONG_MIN的
实现（不是gcc，gcc做我期望的）！我是
害怕看到它对endptr做了什么： - ）
Isn''t:
char s[] = "--4";
char *endptr;
strtol(s, &endptr, 0);
supposed to return 0 and set endptr to s? I have run into an implementation (not gcc, gcc does what I expect) that is returning LONG_MIN!! I am afraid to see what it did to endptr :-)
第三个值应该是你希望它转换成的基数。<我的发行版上的
手册页说如果值
下溢并且它将设置errno，它可以返回LONG_MIN。所以也许一个base-0请求是
下溢？
Tom
The third value is supposed to be the base you want it converted in. The
man pages on my distro say that it can return LONG_MIN if the value
underflows and it will set errno. So maybe a base-0 request is an
underflow?
Tom
" Tom圣丹尼斯 < to*@securescience.net>写道：
"Tom St Denis" <to*@securescience.net> wrote:
" nrk" < RA ********* @ devnull.verizon.net>在消息中写道
新闻：iy *************** @ nwrddc03.gnilink.net ...
"nrk" <ra*********@devnull.verizon.net> wrote in message
news:iy***************@nwrddc03.gnilink.net...
strtol（s，& endptr， 0）;
strtol(s, &endptr, 0);
第三个值应该是你想要它转换的基础。我的发行版上的
手册页说如果值
下溢它可以返回LONG_MIN它会设置errno。那么也许一个基数为0的请求是下溢？
The third value is supposed to be the base you want it converted in. The
man pages on my distro say that it can return LONG_MIN if the value
underflows and it will set errno. So maybe a base-0 request is an
underflow?
或许不是。也许最好在制作之前阅读标准，然后在公共场合做出错误的猜测。如果您已经这样做了，那么您已经知道
，基数为0是对
实现的完全明确定义的请求，以便从字符串中找出基数本身。
Richard
Or maybe not. And maybe it''s better to read the Standard before making
wild-asses wrong guesses in public. If you had done so, you''d have known
that a base of 0 is a perfectly well defined request to the
implementation to figure out the base from the string itself.
Richard
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