#include <iostream>
#include <sstream>  //for ostringstream
#include <cstdlib>
using namespace std;

string formatDouble(long double var)
{
	ostringstream s;
	s << var;
	sTmp = string(s);
	size_t len = sTmp.size() - 1;	//should be string::size_type

	while (sTmp[len] == '0') {
		sTmp = sTmp.sub_str(0, --len);
		if (sTmp[len] == '.') {
			sTmp = sTmp.sub_str(0, --len);
			break;
		}
	}

	return sTmp.empty() ? "0" : sTmp;
}

int main()
{
	cout << formatDouble(3.14) << "\n";
	return EXIT_SUCCESS;
}