Profiling text formatting

int main()
{
	char buffer[32];
	std::string bufferString;
	std::string str[8];
	unsigned int cl[9];
	unsigned int const iterations = 1000000;
	boost::format fmt("%6d");
	cl[0] = std::clock();
	for (unsigned int i = 0; i < iterations; ++i)
	{
		std::sprintf(buffer, "%6d", 132);
		str[0] += buffer;
	}
	cl[1] = std::clock();
	for (unsigned int i = 0; i < iterations; ++i)
	{
		std::snprintf(buffer, 32, "%6d", 132);
		str[1] += buffer;
	}
	cl[2] = std::clock();
	for (unsigned int i = 0; i < iterations; ++i)
	{
		std::ostringstream sstr;
		sstr << std::setw(6) << 132;
		str[2] += sstr.str();
	}
	cl[3] = std::clock();
	for (unsigned int i = 0; i < iterations; ++i)
	{
		std::ostrstream sstr(buffer, 32);
		sstr << std::setw(6) << 132 << std::ends;
		str[3] += buffer;
	}
	cl[4] = std::clock();
	for (unsigned int i = 0; i < iterations; ++i)
	{
		str[4] += boost::lexical_cast< std::string >(132);
	}
	cl[5] = std::clock();
	for (unsigned int i = 0; i < iterations; ++i)
	{
		str[5] += boost::str(boost::format("%6d") % 132);
	}
	cl[6] = std::clock();
	for (unsigned int i = 0; i < iterations; ++i)
	{
		str[6] += boost::str(fmt % 132);
	}
	cl[7] = std::clock();
	for (unsigned int i = 0; i < iterations; ++i)
	{
		formatstream fstr(bufferString);
		fstr << d(132, 6);
		str[7] += bufferString;
	}
	cl[8] = std::clock();
	std::cout << "sprintf:               " << (cl[1] - cl[0]) << " / 1.0\n";
	if (cl[1] == cl[2])
	{
		++cl[1];
	}
	std::cout << "snprintf:              " << (cl[2] - cl[1]) << " / " << (float(cl[2] - cl[1]) / float(cl[1] - cl[0]));
	if (str[1] != str[0])
	{
		std::cout << " FAILED\n";
	}
	else
	{
		std::cout << '\n';
	}
	std::cout << "stringstream:          " << (cl[3] - cl[2]) << " / " << (float(cl[3] - cl[2]) / float(cl[1] - cl[0]));
	if (str[2] != str[0])
	{
		std::cout << " FAILED\n";
	}
	else
	{
		std::cout << '\n';
	}
	std::cout << "strstream:             " << (cl[4] - cl[3]) << " / " << (float(cl[4] - cl[3]) / float(cl[1] - cl[0]));
	if (str[3] != str[0])
	{
		std::cout << " FAILED\n";
	}
	else
	{
		std::cout << '\n';
	}
	std::cout << "lexical_cast:          " << (cl[5] - cl[4]) << " / " << (float(cl[5] - cl[4]) / float(cl[1] - cl[0]));
	if (str[4] != str[0])
	{
		std::cout << " FAILED\n";
	}
	else
	{
		std::cout << '\n';
	}
	std::cout << "boost format (local) : " << (cl[6] - cl[5]) << " / " << (float(cl[6] - cl[5]) / float(cl[1] - cl[0]));
	if (str[5] != str[0])
	{
		std::cout << " FAILED\n";
	}
	else
	{
		std::cout << '\n';
	}
	std::cout << "boost format (global): " << (cl[7] - cl[6]) << " / " << (float(cl[7] - cl[6]) / float(cl[1] - cl[0]));
	if (str[6] != str[0])
	{
		std::cout << " FAILED\n";
	}
	else
	{
		std::cout << '\n';
	}
	std::cout << "formatstream:          " << (cl[8] - cl[7]) << " / " << (float(cl[8] - cl[7]) / float(cl[1] - cl[0]));
	if (str[7] != str[0])
	{
		std::cout << " FAILED\n";
	}
	else
	{
		std::cout << '\n';
	}
}