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!

>>3 is probably right. This sounds like an unflushed¹ buffer issue.

>>4
printf is ridiculously slow. I wish compilers would optimise it instead of having the run-time library decode the format string.

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