conversion of string to all lower case

[DJ]

Can someone tell me the library call that converts strings to lower case or
retrns a new string that is lower case of the original, thanks

im using <string>

David

[DJ]

Re: conversion of string to all lower case

Or perhaps even better a compare that ignores case.

thanks

"DJ" <chopin3@earthl ink.net> wrote in message
news:vVAfd.3379 $kM.1729@newsre ad3.news.pas.ea rthlink.net...[color=blue]
> Can someone tell me the library call that converts strings to lower case[/color]
or[color=blue]
> retrns a new string that is lower case of the original, thanks
>
> im using <string>
>
> David
>
>[/color]

[Julie]

Re: conversion of string to all lower case

DJ wrote:[color=blue]
>
> Or perhaps even better a compare that ignores case.
>
> thanks
>
> "DJ" <chopin3@earthl ink.net> wrote in message
> news:vVAfd.3379 $kM.1729@newsre ad3.news.pas.ea rthlink.net...[color=green]
> > Can someone tell me the library call that converts strings to lower case[/color]
> or[color=green]
> > retrns a new string that is lower case of the original, thanks
> >
> > im using <string>
> >
> > David
> >
> >[/color][/color]

The discussion regarding the (international) caveats of lower/upper case and
case-insensitive *word* comparisons comes up monthly. Check the Google Groups
archives for more blather than you want to read, as well as a couple of
(somewhat) portable/internationaliz ed solutions.

[Ioannis Vranos]

Re: conversion of string to all lower case

Julie wrote:
[color=blue]
> The discussion regarding the (international) caveats of lower/upper case and
> case-insensitive *word* comparisons comes up monthly. Check the Google Groups
> archives for more blather than you want to read, as well as a couple of
> (somewhat) portable/internationaliz ed solutions.[/color]


I am confused by your terminology "internatio nal" here. What do you mean?



--
Ioannis Vranos

http://www23.brinkster.com/noicys

[Ioannis Vranos]

Re: conversion of string to all lower case

DJ wrote:[color=blue]
> Can someone tell me the library call that converts strings to lower case or
> retrns a new string that is lower case of the original, thanks
>
> im using <string>
>
> David[/color]


Check std::toupper() and std::tolower() functions of <cctype>.



--
Ioannis Vranos

http://www23.brinkster.com/noicys

[Rolf Magnus]

Re: conversion of string to all lower case

Ioannis Vranos wrote:
[color=blue]
> Julie wrote:
>[color=green]
>> The discussion regarding the (international) caveats of lower/upper case
>> and case-insensitive *word* comparisons comes up monthly.
>> Check the Google Groups archives for more blather than you want to read,
>> as well as a couple of (somewhat) portable/internationaliz ed solutions.[/color]
>
> I am confused by your terminology "internatio nal" here. What do you mean?[/color]

One example is the german character ß that doesn't have a single uppercase
equivalent. 'Fuß' would need to compare equal to 'FUSS'.

[Ioannis Vranos]

Re: conversion of string to all lower case

Rolf Magnus wrote:
[color=blue]
> One example is the german character ß that doesn't have a single uppercase
> equivalent. 'Fuß' would need to compare equal to 'FUSS'.[/color]


This is not the case here, since we are talking about std::string.

About multilingual characters, one should use wchar_t, std::wstring and
the std::towlower() , std::towupper() of <cwctype>, all guaranteed to work.


C++98:

"Type wchar_t is a distinct type whose values can represent distinct
codes for all members of the largest extended character set specified
among the supported locales (22.1.1). Type wchar_t shall have the same
size, signedness, and alignment requirements (3.9) as one of the other
integral types, called its underlying type."




--
Ioannis Vranos

http://www23.brinkster.com/noicys

[Rolf Magnus]

Re: conversion of string to all lower case

Ioannis Vranos wrote:
[color=blue]
> Rolf Magnus wrote:
>[color=green]
>> One example is the german character ß that doesn't have a single
>> uppercase equivalent. 'Fuß' would need to compare equal to 'FUSS'.[/color]
>
>
> This is not the case here, since we are talking about std::string.
>
> About multilingual characters, one should use wchar_t, std::wstring and
> the std::towlower() , std::towupper() of <cwctype>, all guaranteed to work.[/color]

How do those handle such a conversion? The main point here is that the
number of characters in the uppercase version and in the lowercase version
are not equal. Character-based toupper and tolower can't handle that.

[Ioannis Vranos]

Re: conversion of string to all lower case

Rolf Magnus wrote:
[color=blue]
> How do those handle such a conversion? The main point here is that the
> number of characters in the uppercase version and in the lowercase version
> are not equal. Character-based toupper and tolower can't handle that.[/color]




However they work for Greek and English and I assume all languages with
one to one, lower-case to upper-case correspondence, so I guess it is
for such languages and up to the programmer to take this decision.



--
Ioannis Vranos

http://www23.brinkster.com/noicys

[Julie]

Re: conversion of string to all lower case

Ioannis Vranos wrote:[color=blue]
>
> Julie wrote:
>[color=green]
> > The discussion regarding the (international) caveats of lower/upper case and
> > case-insensitive *word* comparisons comes up monthly. Check the Google Groups
> > archives for more blather than you want to read, as well as a couple of
> > (somewhat) portable/internationaliz ed solutions.[/color]
>
> I am confused by your terminology "internatio nal" here. What do you mean?[/color]

I mean that there are languages that apparently do not have a 1-1
correspondence between upper and lower case words (and characters).

For English, u/l case comparisons are trivial. For German, there are issues.

This is what I mean about 'international' -- if the OP is writing a
locale-independent application (assumed to be the case unless indicated
otherwise), they will have to contend w/ such 'international' issues.

[Ioannis Vranos]

Re: conversion of string to all lower case

Julie wrote:
[color=blue]
> I mean that there are languages that apparently do not have a 1-1
> correspondence between upper and lower case words (and characters).
>
> For English, u/l case comparisons are trivial. For German, there are issues.
>
> This is what I mean about 'international' -- if the OP is writing a
> locale-independent application (assumed to be the case unless indicated
> otherwise), they will have to contend w/ such 'international' issues.[/color]


However the OP was talking about std::string and not std::wstring.



--
Ioannis Vranos

http://www23.brinkster.com/noicys

[Julie]

Re: conversion of string to all lower case

Ioannis Vranos wrote:[color=blue]
>
> Julie wrote:
>[color=green]
> > I mean that there are languages that apparently do not have a 1-1
> > correspondence between upper and lower case words (and characters).
> >
> > For English, u/l case comparisons are trivial. For German, there are issues.
> >
> > This is what I mean about 'international' -- if the OP is writing a
> > locale-independent application (assumed to be the case unless indicated
> > otherwise), they will have to contend w/ such 'international' issues.[/color]
>
> However the OP was talking about std::string and not std::wstring.[/color]

OP:

"im using <string>"

No further information was provided about specific type or locale dependence,
therefore not assumed in my responses.

[Ioannis Vranos]

Re: conversion of string to all lower case

Julie wrote:
[color=blue][color=green]
>>However the OP was talking about std::string and not std::wstring.[/color]
>
>
> OP:
>
> "im using <string>"
>
> No further information was provided about specific type or locale dependence,
> therefore not assumed in my responses.[/color]


From the subject "conversion of string to all lower case" and the question

"Can someone tell me the library call that converts strings to lower
case or retrns a new string that is lower case of the original, thanks

im using <string>"


it looks like he is asking about the usual stuff.



--
Ioannis Vranos

http://www23.brinkster.com/noicys

[Julie]

Re: conversion of string to all lower case

Ioannis Vranos wrote:[color=blue]
>
> Julie wrote:
>[color=green][color=darkred]
> >>However the OP was talking about std::string and not std::wstring.[/color]
> >
> >
> > OP:
> >
> > "im using <string>"
> >
> > No further information was provided about specific type or locale dependence,
> > therefore not assumed in my responses.[/color]
>
> From the subject "conversion of string to all lower case" and the question
>
> "Can someone tell me the library call that converts strings to lower
> case or retrns a new string that is lower case of the original, thanks
>
> im using <string>"
>
> it looks like he is asking about the usual stuff.[/color]

Right -- and I gave the usual answer.

nfc

[Ioannis Vranos]

Re: conversion of string to all lower case

Julie wrote:
[color=blue][color=green]
>>it looks like he is asking about the usual stuff.[/color]
>
>
> Right -- and I gave the usual answer.[/color]


I don't think so. In simple words, he is talking about chars and you
about wchar_ts.



--
Ioannis Vranos

http://www23.brinkster.com/noicys