c++ force std::cout flush (print to screen)
Solution 1:
Just insert std::flush:
std::cout << "Beginning computations..." << std::flush;
Also note that inserting std::endl will also flush after writing a newline.
Solution 2:
In addition to Joseph Mansfield answer, std::endl does the flush too (besides a new line).
Inserts a endline character into the output sequence os and flushes it as if by calling os.put(os.widen('\n')) followed by os.flush().