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Factor documentation > Factor handbook > The language > Numbers > Arithmetic > Number protocol
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Vocabulary
math

Inputs and outputs
xa number
ya number
za number


Word description
Subtracts y from x.
• Subtraction of fixnums may overflow and convert the result to a bignum.
• Subtraction of bignums always yields a bignum.
• Subtraction of floats always yields a float.
• Subtraction of ratios and complex numbers proceeds using the relevant mathematical rules.


Definition
IN: math

MATH: - ( x y -- z ) foldable flushable


Methods
USING: math math.private ;

M: bignum - bignum- ; inline


USING: math math.complex.private ;

M: complex - [ - ] complex-op ; inline


USING: math math.private ;

M: fixnum - fixnum- ; inline


USING: math math.private ;

M: float - float- ; inline


USING: kernel math math.ratios.private ;

M: ratio - [ scale - ] [ ratio+d ] 2bi / ;