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When you are displaying information about evident errors, however, it is
better programming practice to use the cerr stream, rather than
the cout stream. One reason is that characters sent to your screen
via the cout stream are buffered, which means that they may not
appear on your screen until an end-of-line symbol, endl, is
encountered. In contrast, characters sent to your screen via the
cerr stream are not buffered; they appear immediately.