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157 lines
2.3 KiB
Markdown
157 lines
2.3 KiB
Markdown
# SRFI 143 - Fixnums
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This SRFI describes arithmetic procedures applicable to a limited range of exact integers only. These procedures are semantically similar to the corresponding generic-arithmetic procedures, but allow more efficient implementations.
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See the [SRFI document](http://srfi.schemers.org/srfi-143/srfi-143.html) for more information.
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## Constants
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[`fx-width`](#fx-width)
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[`fx-greatest`](#fx-greatest)
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[`fx-least`](#fx-least)
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## Predicates
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[`fixnum?`](#fixnum)
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[`fx=?`](#fx)
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[`fx<?`](#fx-1)
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[`fx>?`](#fx-2)
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[`fx<=?`](#fx-3)
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[`fx>=?`](#fx-4)
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[`fxzero?`](#fxzero)
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[`fxpositive?`](#fxpositive)
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[`fxnegative?`](#fxnegative)
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[`fxodd?`](#fxodd)
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[`fxeven?`](#fxeven)
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[`fxmax`](#fxmax)
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[`fxmin`](#fxmin)
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## Basic arithmetic
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[`fx+`](#fx-5)
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[`fx-`](#fx-)
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[`fx*`](#fx-6)
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[`fxneg`](#fxneg)
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[`fxquotient`](#fxquotient)
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[`fxremainder`](#fxremainder)
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[`fxabs`](#fxabs)
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[`fxsquare`](#fxsquare)
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[`fxsqrt`](#fxsqrt)
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# Bitwise operations
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[`fxnot`](#fxnot)
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[`fxand`](#fxand)
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[`fxior`](#fxior)
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[`fxxor`](#fxxor)
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[`fxarithmetic-shift`](#fxarithmetic-shift)
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[`fxarithmetic-shift-left`](#fxarithmetic-shift-left)
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[`fxarithmetic-shift-right`](#fxarithmetic-shift-right)
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[`fxbit-count`](#fxbit-count)
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[`fxlength`](#fxlength)
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[`fxif`](#fxif)
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[`fxbit-set?`](#fxbit-set)
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[`fxcopy-bit`](#fxcopy-bit)
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[`fxfirst-set-bit`](#fxfirst-set-bit)
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[`fxbit-field`](#fxbit-field)
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[`fxbit-field-rotate`](#fxbit-field-rotate)
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[`fxbit-field-reverse`](#fxbit-field-reverse)
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# fx-width
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(fx-width)
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Bound to the value `w` that specifies the implementation-defined fixnum integer range.
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# fx-greatest
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(fx-greatest)
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Returns value of the largest representable fixnum.
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# fx-least
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(fx-least)
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Returns value of the smallest representable fixnum.
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# fixnum?
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(fixnum? obj)
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Returns `#t` if `obj` is an exact integer within the fixnum range, and `#f` otherwise.
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# fx=?
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(fx=? i j)
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Semantically equivalent to `=`.
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# fx<?
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# fx>?
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# fx<=?
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# fx>=?
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# fxzero?
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# fxpositive?
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# fxnegative?
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# fxodd?
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# fxeven?
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# fxmax
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# fxmin
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# fx+
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# fx-
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# fx*
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# fxneg
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# fxquotient
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# fxremainder
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# fxabs
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# fxsquare
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# fxsqrt
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# fxnot
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# fxand
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# fxior
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# fxxor
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# fxarithmetic-shift
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# fxarithmetic-shift-left
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# fxarithmetic-shift-right
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# fxbit-count
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# fxlength
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# fxif
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# fxbit-set?
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# fxcopy-bit
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# fxfirst-set-bit
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# fxbit-field
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# fxbit-field-rotate
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# fxbit-field-reverse
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