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Taylor Campbell <campbell@xxxxxxxxxx> writes: > But NaN conditions can be signalled like error conditions can be; When the INVALID exception is signalled, there is nothing to print. The issue of printing and reading NaNs arises only when the exception is not signalled and the operation yields a NaN instead, which is the default in IEEE. > this is typically what is done with exact arithmetic, such as in > Scheme48: > > (/ 0 0) => Error: rational division by zero Of course; because in the case of exact arithmetic the problem definitely means that the function is undefined at this point. With inexact arithmetic it might just result from rounding errors, so a computation can't expect it in advance, thus it's not generally a symptom of a bug. -- __("< Marcin Kowalczyk \__/ qrczak@xxxxxxxxxx ^^ http://qrnik.knm.org.pl/~qrczak/