[Greg Ewing] > Maybe there should be a separate operator for rational > division? > > 1/3 --> float > 1//3 --> int > 1///3 --> rational > > (Okay, a 3-char operator is a bit verbose, but I can't > think of anything else that looks division-like just at > the moment.) I much like Emacs Calc usage of 3:2 or 1:1:2 (no embedded space) for a fraction constant, read or printed. I find this more legible and comfortable to read than 3/2 or `1 1/2'. There is a Calc setting to decide if division generates floats or fractions, but Guido is probably right in choosing that `/' should not be magical enough to produce rationals. One might presume that introducing `:' between numbers at the syntactic level has just no chance to ever work. But _maybe_ it could be more tractable at the lexical level without bringing too much confusion, and for numerical _constants_ only -- 3:2 is one number, has never been two. Rationals could be got through a cast or constructor, or by introducing rational objects into the computation, like rational constants would be. -- François Pinard http://www.iro.umontreal.ca/~pinard
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