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Joe English scripsit: > Not necessarily: the infix operator "-" can easily be > defined as an operation on strings. Parse the left and > right operands as numbers (raising an error if they're not > syntactically valid), subtract one from the other, then > format the result as a string. Indeed, you can go further, using the REXX approach, where arithmetic is defined *directly* on (suitably) restricted strings, with no concept of conversion (except conversion between individual *digits* and numbers, which can be done by a table). The same algorithms are used that we learned in primary school. -- Knowledge studies others / Wisdom is self-known; John Cowan Muscle masters brothers / Self-mastery is bone; jcowan@r... Content need never borrow / Ambition wanders blind; www.ccil.org/~cowan Vitality cleaves to the marrow / Leaving death behind. --Tao 33 (Bynner)
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