右截断的浮点变量 [英] right truncate of float variable
问题描述
我有一个浮点变量，如123456789
我想要截断这个并且只显示最多8个最右边的值
所有的时间或以零填充为零它是不到8位数，请
你知道我怎么能显示这个？
谢谢
J.
I have a float variable like 123456789
I want to right truncate this and only display say only 8 right most values
all the time or otherwise filled by zeros if it is less than 8 digits, do
you know how can i display this?
Thanks
J.
推荐答案
在文章< de ********** @ reader01.news.esat.net>中，
Joriveek< no **** @ please.com>写道：
In article <de**********@reader01.news.esat.net>,
Joriveek <no****@please.com> wrote:
我有一个浮动变量，如123456789
我想要截断这个并且只显示只说8个最右边的值
所有的时间或以其他方式用零填充如果它是不到8位，你知道我怎么能显示这个？
I have a float variable like 123456789
I want to right truncate this and only display say only 8 right most values
all the time or otherwise filled by zeros if it is less than 8 digits, do
you know how can i display this?
如果值是（例如）3.1415926535你想做什么？
您只需要显示15926535吗？
-
那时候我还很年轻，但我也很朦胧。 br />
- 克里斯托弗·普里斯特
What do you want done if the value is (e.g.,) 3.1415926535 ?
You would only want the 15926535 displayed?
--
I was very young in those days, but I was also rather dim.
-- Christopher Priest
是的...只有最后10位......
Thanx
" Walter Roberson" < RO ****** @ ibd.nrc-cnrc.gc.ca>在消息中写道
news：de ********** @ canopus.cc.umanitoba.ca ...
yes...only last 10 digits....
Thanx
"Walter Roberson" <ro******@ibd.nrc-cnrc.gc.ca> wrote in message
news:de**********@canopus.cc.umanitoba.ca...
在文章< de ** ********@reader01.news.esat.net>，
Joriveek< no **** @ please.com>写道：
In article <de**********@reader01.news.esat.net>,
Joriveek <no****@please.com> wrote:
我有一个浮点变量，如123456789
我想要截断这个并且只显示最多只说8个值
一直或以其他方式填写如果它小于8位，则为零。确定
你知道如何显示它吗？
I have a float variable like 123456789
I want to right truncate this and only display say only 8 right most
values
all the time or otherwise filled by zeros if it is less than 8 digits, do
you know how can i display this?
如果值是（例如）3.1415926535，你想要做什么？
你只想要显示15926535吗？
-
那时候我很年轻，但我也很朦胧。
- Christopher Priest
What do you want done if the value is (e.g.,) 3.1415926535 ?
You would only want the 15926535 displayed?
--
I was very young in those days, but I was also rather dim.
-- Christopher Priest
在文章< de ********** @ reader01.news.esat.net>，
Joriveek< no****@please.com> top-posted：
[注意：请不要发帖：它会使谈话难以理解]
In article <de**********@reader01.news.esat.net>,
Joriveek <no****@please.com> top-posted:
[Note: please do not top-post: it makes conversations harder to follow]
" Walter Roberson" < RO ****** @ ibd.nrc-cnrc.gc.ca>在消息中写道
新闻：de ********** @ canopus.cc.umanitoba.ca ...
"Walter Roberson" <ro******@ibd.nrc-cnrc.gc.ca> wrote in message
news:de**********@canopus.cc.umanitoba.ca...
在文章< de ****** ****@reader01.news.esat.net>，
Joriveek< no **** @ please.com>写道：
In article <de**********@reader01.news.esat.net>,
Joriveek <no****@please.com> wrote:
我有一个浮点变量，如123456789
我想要截断这个并且只显示最多只说8个值
一直或以其他方式填写如果它小于8位，则按0，你知道我怎么能显示这个？
I have a float variable like 123456789
I want to right truncate this and only display say only 8 right most
values
all the time or otherwise filled by zeros if it is less than 8 digits, do
you know how can i display this?
如果值是（例如），你想做什么？3.1415926535？
你只想要15926535显示？
What do you want done if the value is (e.g.,) 3.1415926535 ?
You would only want the 15926535 displayed?
yes ...只有最后10位....
yes...only last 10 digits....
在原始帖子中，你说8，这次你说10，
恰好是我给的小数点后面的位数
。什么是规则 - 如果小数部分为0，则在
判定点之前的最后8位数，并且小数部分小数点后的前10位数字
为非0 ??
你确实意识到，当你进入更大的价值
如123456789012345时，表示为浮动是
不准确？例如在我碰巧使用的系统上：
（dbx）p（浮动）123456789012345
123456788103168.0
请注意，最后7个地方与原始号码不一致。
除非有什么东西你没告诉我们 - 很好 -
限制浮动的值，然后浮动对于特定内部位置
比数量更重要时表示数字的选择一点都不好。
/>
-
没有人有权通过
要求经验证据来摧毁他人的信念。 - Ann Landers
In your original posting, you said 8, and this time you said 10,
which just happens to be the number of digits after the decimal point
that I gave. What is the "rule" -- the last 8 digits before the
deciminal point if the fractional part is 0, and the first 10 digits
after the decimal point of the fractional part is non-0 ??
You do realize, I hope, that as you get into larger values
such as 123456789012345 that the representation as a float is
inexact? For example on the system I happen to be using:
(dbx) p (float) 123456789012345
123456788103168.0
Notice that the last 7 places do not agree with the original number.
Unless there is something you haven''t told us about that -greatly-
restricts the values of the float, then float is not at all a good
choice for representation of numbers when particular interior positions
are more important than magnitude.
--
"No one has the right to destroy another person''s belief by
demanding empirical evidence." -- Ann Landers
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