Erasing using backspace control character

Question

I am trying to use the backspace control character \'\\b\' to erase trailing commas at the end of line. Although it works in cases where there is no other outpu

Answer 1

Or, if you're fond of C+11 hacks:

adjacent_difference(a.begin(), a.end(), ostream_iterator(std::cout),
  [](int x, int)->int { return std::cout << ",", x; });