法语到英语的数字转换 [英] french to english numeric conversion

问题描述

我过去一周花了很长时间阅读Josuttis书中的语言环境

和Stroustrup。作为区域设置的简单测试，我在下面准备了以下

源代码。目的是将法国十进制数字

1.234,567转换为英语等价物1,234.567。

std :: locale oFrenchLocale（" French_Canada.1252"）;

std :: string oS =" 1.234,456" ;;

std :: istringstream oISS（oS）;

std :: locale oOldLocale = oISS.imbue（oFrenchLocale）;

double dValue;

oISS>> dValue;

oISS.imbue（oOldLocale）;

std :: cout<< " \ n string =" << oS.c_str（）<< \ n dValue =" << dValue;


输出为：

string = 1.234,456

dValue = 1


我期待dValue的值为1,234.567，但它只有
a值为1.会不会有人向我提供我正在犯的错误。

先谢谢。


Ian

I have just spent the past week reading up on locales in books by Josuttis
and Stroustrup. As a simple test of locales, I prepared the following
source code below. The purpose is to convert the French decimal number
1.234,567 to the English equivalent of 1,234.567.
std::locale oFrenchLocale( "French_Canada.1252" );
std::string oS = "1.234,456";
std::istringstream oISS( oS );
std::locale oOldLocale = oISS.imbue( oFrenchLocale );
double dValue;
oISS >> dValue;
oISS.imbue( oOldLocale );
std::cout << "\n string=" << oS.c_str() << "\n dValue=" << dValue;

The output is:
string=1.234,456
dValue=1

I was expecting dValue to have a value of 1,234.567 but instead it only has
a value of 1. Would someone kindly provide me with the mistake I am making.

Thanks in advance.

Ian

推荐答案

jd写道：

过去一周我一直在阅读Josuttis和Stroustrup撰写的书籍中的语言环境。作为区域设置的简单测试，我在下面准备了以下源代码。目的是将法语
十进制数1.234,567转换为英语等值1,234.567。

std :: locale oFrenchLocale（" French_Canada.1252"）;
std :: string oS =" 1.234,456";
std :: istringstream oISS（oS）;
std :: locale oOldLocale = oISS.imbue（oFrenchLocale）;
double dValue;
oISS>> dValue;
^^^^^^^^^^^^^^^^^让我们称之为第六行

oISS.imbue（oOldLocale）;
std :: cout<< " \ n string =" << oS.c_str（）<< \ n dValue =" << dValue;

输出结果为：
string = 1.234,456
dValue = 1

我期待dValue的值为1,234.567，而是它只有一个值1.有人会向我提出我正在犯的错误。

I have just spent the past week reading up on locales in books by
Josuttis and Stroustrup. As a simple test of locales, I prepared the
following source code below. The purpose is to convert the French
decimal number 1.234,567 to the English equivalent of 1,234.567.
std::locale oFrenchLocale( "French_Canada.1252" );
std::string oS = "1.234,456";
std::istringstream oISS( oS );
std::locale oOldLocale = oISS.imbue( oFrenchLocale );
double dValue;
oISS >> dValue; ^^^^^^^^^^^^^^^^^ Let''s call this "line six"
oISS.imbue( oOldLocale );
std::cout << "\n string=" << oS.c_str() << "\n dValue=" << dValue;

The output is:
string=1.234,456
dValue=1

I was expecting dValue to have a value of 1,234.567 but instead it
only has a value of 1. Would someone kindly provide me with the
mistake I am making.

我不是很精通locales，但我怀疑千元

分隔符不被接受作为数字的一部分（并被忽略）而

被视为字段分隔符所以第六行的输入仅仅是1和b。并停止。尝试从字符串中删除期间

使其成为


std :: string oS =" 1234,456";


..


V

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请在回复时删除资金''A' -mail

我没有回复最热门的回复，请不要问

I am not very proficient in locales, but I suspect that the "thousands"
separator is not being accepted as part of the number (and ignored) and
instead is treated as a field separator so that the input on "line six"
only reads the "1" and stops. Try dropping the period from the string
making it

std::string oS = "1234,456";

..

V
--
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I do not respond to top-posted replies, please don''t ask

2006年4月12日星期三19:58 ：16 -0400Victor Bazarov

< v。******** @ comAcast.net>挥舞着魔杖，这条消息神奇地出现了：

：

On Wed, 12 Apr 2006 19:58:16 -0400 "Victor Bazarov"
<v.********@comAcast.net> waved a wand and this message magically
appeared:

std :: cout<< " \ n string =" << oS.c_str（）<< \ n dValue =" << dValue;

std::cout << "\n string=" << oS.c_str() << "\n dValue=" << dValue;

哪一个更好，'<< oS<<''或''<< oS.c_str（）''？


-
http://www.munted.org.uk


小睡一下，它可以拯救生命。

Which one''s better, ''<< oS <<'' or ''<< oS.c_str()''?

--
http://www.munted.org.uk

Take a nap, it saves lives.

Alex Buell写道：

Alex Buell wrote:

2006年4月12日星期三19:58:16 -0400" Victor Bazarov"
< v。******** @ comAcast.net>挥舞着魔杖，这条消息神奇地出现了：

On Wed, 12 Apr 2006 19:58:16 -0400 "Victor Bazarov"
<v.********@comAcast.net> waved a wand and this message magically
appeared:

std :: cout<< " \ n string =" << oS.c_str（）<< \ n dValue =" << dValue;

std::cout << "\n string=" << oS.c_str() << "\n dValue=" << dValue;

哪一个更好，'<< oS<<''或''<< oS.c_str（）''？

Which one''s better, ''<< oS <<'' or ''<< oS.c_str()''?

我不确定...... Lemme看到......<翻阅标准>

我找不到任何会使<<<< OS"有效...但是它在线编辑用b = b
...无论如何。懒得搞清楚。


我更喜欢隐含的转换。这就是为什么我可能会使用

后者。


V

-

请在通过电子邮件回复时删除资金''A'

我没有回复最热门的回复，请不要问

I am not sure... Lemme see... <leafing through the Standard>
I can''t find anything that would make "<< oS" valid... But it compiles
with online Comeau... Whatever. Too lazy to figure it out.

I prefer fewer implicit conversions. That''s why I''d probably use the
latter.

V
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