comparison of boost hex algorithm and printf conversion specifier

boost_hex.cc

// re: http://stackoverflow.com/questions/28489153/how-to-portably-compute-a-sha1-hash-in-c/39833022#39833022

#include <boost/uuid/sha1.hpp>
#include <boost/detail/endian.hpp>
#include <boost/algorithm/hex.hpp>
#include <boost/range/iterator_range_core.hpp>
#include <boost/endian/conversion.hpp>
#include <iostream>
#include <stdio.h>
using namespace std;

int main(int argc, char **argv)
{
  unsigned i = 1;
  unsigned j = boost::endian::native_to_big(i);
  boost::algorithm::hex(boost::make_iterator_range(
        reinterpret_cast<const char*>(&j),
        reinterpret_cast<const char*>(&j+1)),
      ostream_iterator<char>(cout)); cout << '\n';
  printf("%08x\n", i);
  printf("%08x\n", j);
  return 0;
}

/* Output:

00000001
00000001
01000000

*/