rem ( x y -- z )
Factor handbook > The language > Numbers > Arithmetic > Modular arithmetic

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Inputs and outputs
xa rational
ya rational
za rational

Word description
Computes the remainder of dividing x by y, with the remainder always positive or zero.
Given fixnums, always yields a fixnum.
Given bignums, always yields a bignum.
Given rationals, always yields a rational.

See also
Division by zero, mod