Why does using std::endl with ostringstream affect output speed?

Question

I\'m timing the difference between various ways to print text to standard output. I\'m testing cout, printf, and ostringstream using both

Answer 1

Using std::endl is equivalent to writing

stream << "\n";
stream.flush();

Don't use std::endl unless you actually want to trigger flushing, and / or don't care about output performance.

Also, don't worry about different line endings on different platforms, your implementation will translate "\n" to the line ending appropriate for your platform.