#include
#include
#include
using namespace std;
class Separator_facet: public numpunct
{
public:
explicit Separator_facet( size_t refs = 0): numpunct( refs ){}
protected:
virtual string do_grouping() const{ return "\3"; }
};
int main()
{
const int million = 1000000;
const double number = 1234.56789;
cout << million << fixed << setprecision( 5 ) << number;
locale separator_locale( cout.getloc(), new Separator_facet );
cout.imbue( separator_locale );
cout << million << " " << number << endl;
}