C++ printing in a loop

Hello!
Does anyone know how to tell the program to print stuff each single step in my loop?
Whenever i execute the program it just prints the very last step:

  for( uint i = 0; i < iter; i++) {
    [...]
    std::cout << "stuff";
  }

Thanks!

Maybe i wasn't clear: I want to let the program print stuff every step but it only prints *all* steps at the end.