[TriLUG] [OT] C++ question: currency formatting like java NumberFormat in C++?

[Owen Berry]

money_put::put takes a long double, or a string (i.e. it's overloaded).
Neither should have decimal points ... I'm guessing that's by design
because different locales use different symbols for decimal points.

Owen

On Tue, 2006-07-18 at 20:43 -0400, Doug Taggart wrote:
> Thanks Owen,  I'll have to read up a bit to comprehend what's happening 
> here.
> There's some c++ syntax that is new to me here also.
> 
> I did compile the money.cpp version on your website though and got
> $12,343.87 as output
> I would have actually expected
> $1,234,387.00 based on the value variable, but I'll have to read more to 
> see how that happens.
> 
> Doug Taggart
> 
> Owen Berry wrote:
> 
> >And below is some sample code: 
> >
> >#include <iostream>
> >#include <locale>
> >
> >using namespace std;
> >typedef ostreambuf_iterator<char,char_traits<char> > Iter;
> >
> >int main(int argc, char* argv[])
> >{
> >    long double value = 1234387;
> >    locale loc("en_US");
> >
> >    // Get money_put reference for locale
> >    const money_put<char> &mp = use_facet<money_put<char> >(loc);
> >
> >    cout.imbue(loc);	// Set locale for cout
> >    cout << showbase;	// Display currency symbol
> >
> >    // Put formatted value on cout
> >    mp.put (Iter(cout), false, cout, ' ', value);
> >
> >    cout << endl;
> >}
> >
> >You can download it from http://www.trilug.org/~oberry/money.cpp, with a
> >few additional comments. My success in getting this to work with
> >European locales was patchy, maybe due to the currency changes with the
> >EU, but it worked for the US and South Africa (my land of origin). Tried
> >it on 3 different machines and it worked fine.
> >
> >For some information on the details, you'll need to do some reading of
> >your own, as mentioned in my previous reply (below).
> >
> >Owen
> >
> >On Fri, Jul 14, 2006 at 04:31:58PM -0400, Owen Berry wrote:
> >  
> >
> >>Sorry to reply to this after the fact, but it was a case of getting to
> >>the right book in the right place. Unfortunately I can't tell you
> >>exactly what to do, but I can try to point you in the right direction.
> >>What you need to look at is locales and facets ... search for "c++
> >>locale facet" in Google and you'll come up some stuff.
> >>
> >>Also, if you have access to "The C++ Standard Library" by Josuttis there
> >>is some info in the internationalization section.
> >>
> >>I'm interested, so if I have a chance I'll send out an example if I have
> >>a chance to put one together. Unfortunately I don't understand this yet,
> >>so I'm much in the same boat.
> >>
> >>Owen
> >>
> >>On Thu, Jul 13, 2006 at 01:25:22PM -0400, Doug Taggart wrote:
> >>    
> >>
> >>>Hello,
> >>>
> >>>I'm hoping someone can help me with something that I think should have 
> >>>been easy for me to find.
> >>>
> >>>I'm coding a C++ program.  I have a need to format a number for currency 
> >>>display.
> >>>
> >>>In Java, I would use this for a quick and dirty way of getting US 
> >>>dollars (not checking for international stuff).
> >>>
> >>>NumberFormat currency = NumberFormat.getCurrencyInstance(); 
> >>>
> >>>Then wherever I needed too I could.
> >>>currency.format(myNumericVariable)  into a section of code that 
> >>>displayed the return value as nice nifty US dollars complete
> >>>with $, decimal point and ,'s as appropriate.
> >>>
> >>>=====
> >>>
> >>>I can't seem to find something similar as part of the standard c/c++ 
> >>>libraries, which I find hard to believe.
> >>>I'm sure I'm just not searching for the right terms, "NumberFormat", 
> >>>"currency", "money", "formatting" etc..
> >>>
> >>>Anyway, pointers appreciated..
> >>>
> >>>Doug T
> >>>      
> >>>
>