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*To*: Common-Lisp at SU-AI*Subject*: trunc*From*: Earl A. Killian <Killian at MIT-MULTICS>*Date*: Wed, 07 Jul 1982 18:20:00 -0000

Warning: the definition of trunc in Common Lisp is not the same as an integer divide instruction on most machines (except the S-1). The difference occurs when the divisor is negative. For example, (trunc 5 -2) is defined to be the same as (trunc (/ 5 -2)) = (trunc -2.5) = -2, whereas most machines divide such that the sign of the remainder is the same as the sign of the dividend (aka numerator), which gives -3 for 5/-2. Implementors should make sure that they do the appropriate testing (ugh), unless someone wants to propose kludging the definition.

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