* ( x y -- z )
Factor handbook » The language » Numbers » Arithmetic » Number protocol

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Vocabulary
math

Inputs

x	a number
y	a number

Outputs

z

a number

Word description
Multiplies two numbers.

•	Multiplication of fixnums may overflow and convert the result to a bignum.
•	Integer multiplication yields a fixnum when the result fits, and a bignum otherwise.
•	Multiplication of floats always yields a float.
•	Multiplication 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: kernel math math.complex.private ;

M: complex * [ *re - ] [ *im + ] 2bi rect> ; inline


USING: math math.private ;

M: fixnum * fixnum* ; inline


USING: math math.private ;

M: float * float* ; inline


USING: kernel math math.ratios ;

M: ratio * 2>fraction [ * ] 2bi@ / ;