Re: Doubles and Integers as strings.

From:
"Alex Blekhman" <xfkt@oohay.moc>
Newsgroups:
microsoft.public.vc.language
Date:
Mon, 16 Apr 2007 20:28:33 +0300
Message-ID:
<#V8VqyEgHHA.1008@TK2MSFTNGP05.phx.gbl>
"GeorgeJ" wrote:

1) Is there a way, using syntax similar to that Alex used
in his post, e. g.
double f1 = 1.23E2;
  cout << setprecision(2) << fixed << f1 << '\n';
   cout << scientific << f1 << '\n';
   cout << fixed << ' ' << f1 << ' ' << '\n';
to have all that stuff go into a string S1 rather that to
the console, and
then do

   cout << S1 ?


Yes, you can make such string by using string streams.
That's why concept of streams was invented in first place:
to separate input/output peculiarities (formats, locales,
etc.) and actual media, which carries bytes, be it file on
disk, string, console or any other device.

In order to make `s1' string from above example, you just
create output string stream:

#include <sstream>
#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
    double f1 = 1.23E2;
    ostringstream oss;

    oss << setprecision(2) << fixed << f1 << '\n';
    oss << scientific << f1 << '\n';
    oss << fixed << ' ' << f1 << ' ' << '\n';

    // Using const reference to avoid
    // redundant string copy.
    const string& s1 = oss.str();

    cout << s1;

    return 0;
}

2) where in the help file of Visual Studio 2003 might I
find detailed info
explaining formatted output using cout?


You should have MSDN DVD with VS2003 installation.
Alternatively, you can download MSDN Library directly from
MS site:

"MSDN Library (April 2007 Edition)"
http://www.microsoft.com/downloads/details.aspx?FamilyID=b8704100-0127-4d88-9b5d-896b9b388313&DisplayLang=en

Or just look in MSDN Library online:

"iostream Programming"
http://msdn2.microsoft.com/en-us/library/22z6066f(VS.71).aspx

Alex

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