numpunct::grouping

// numpunct::grouping example
#include <iostream>
#include <locale>
using namespace std;

string format_grouping (long value,string grouping)
{
  string result;
  long temp=value;
  size_t group=0;

  if (grouping.size()==0) grouping="\03";
  if (temp==0) return "0";

  while (true)
  {
    for (int i=0; i<grouping[group]; ++i)
	  {result=char('0'+temp%10)+result;temp/=10;if (temp==0) break;}
	if (grouping.size()>group+1) ++group;
	if (temp>0) result=","+result; else break;
  }
  return result;
}

int main ()
{
  string grouping = use_facet<numpunct<char> >(cout.getloc()).grouping();

  cout << format_grouping (43112279,grouping) << endl;

  return 0;
}