Module: LongDecimalRoundingMode

Included in:

LongDecimalBase, LongMath

Defined in:

lib/long-decimal.rb

Overview

define rounding modes to be used for LongDecimal this serves the purpose of an “enum” in C/C++/Java

Defined Under Namespace

Classes: RoundingModeClass, ZeroRoundingModeClass

Constant Summary

ROUND_UP =

rounding modes as constants

RoundingModeClass.new(:ROUND_UP, 0)

ROUND_DOWN =

RoundingModeClass.new(:ROUND_DOWN, 1)

ROUND_CEILING =

RoundingModeClass.new(:ROUND_CEILING, 2)

ROUND_FLOOR =

RoundingModeClass.new(:ROUND_FLOOR, 3)

ROUND_HALF_UP =

RoundingModeClass.new(:ROUND_HALF_UP, 4)

ROUND_HALF_DOWN =

RoundingModeClass.new(:ROUND_HALF_DOWN, 5)

ROUND_HALF_CEILING =

RoundingModeClass.new(:ROUND_HALF_CEILING, 6)

ROUND_HALF_FLOOR =

RoundingModeClass.new(:ROUND_HALF_FLOOR, 7)

ROUND_HALF_EVEN =

RoundingModeClass.new(:ROUND_HALF_EVEN, 8)

ROUND_UNNECESSARY =

RoundingModeClass.new(:ROUND_UNNECESSARY, 9)

MUL_INVERSE_MODE =

which mode is to be used instead when we do an multiplicative inversion?

{
  ROUND_UP           =>   ROUND_DOWN,
  ROUND_DOWN         =>   ROUND_UP,
  ROUND_CEILING      =>   ROUND_FLOOR,
  ROUND_FLOOR        =>   ROUND_CEILING,
  ROUND_HALF_UP      =>   ROUND_HALF_DOWN,
  ROUND_HALF_DOWN    =>   ROUND_HALF_UP,
  ROUND_HALF_CEILING =>   ROUND_HALF_FLOOR,
  ROUND_HALF_FLOOR   =>   ROUND_HALF_CEILING,
  ROUND_HALF_EVEN    =>   ROUND_HALF_EVEN,
  ROUND_UNNECESSARY  =>   ROUND_UNNECESSARY
}

ADD_INVERSE_MODE =

which mode is to be used instead when we do an additive inversion?

{
  ROUND_UP           =>   ROUND_UP,
  ROUND_DOWN         =>   ROUND_DOWN,
  ROUND_CEILING      =>   ROUND_FLOOR,
  ROUND_FLOOR        =>   ROUND_CEILING,
  ROUND_HALF_UP      =>   ROUND_HALF_UP,
  ROUND_HALF_DOWN    =>   ROUND_HALF_DOWN,
  ROUND_HALF_CEILING =>   ROUND_HALF_FLOOR,
  ROUND_HALF_FLOOR   =>   ROUND_HALF_CEILING,
  ROUND_HALF_EVEN    =>   ROUND_HALF_EVEN,
  ROUND_UNNECESSARY  =>   ROUND_UNNECESSARY
}

ZERO_ROUND_TO_PLUS =

rounding modes as constants

ZeroRoundingModeClass.new(:ZERO_ROUND_TO_PLUS, 0)

ZERO_ROUND_TO_MINUS =

ZeroRoundingModeClass.new(:ZERO_ROUND_TO_MINUS, 1)

ZERO_ROUND_TO_CLOSEST_PREFER_PLUS =

ZeroRoundingModeClass.new(:ZERO_ROUND_TO_CLOSEST_PREFER_PLUS, 2)

ZERO_ROUND_TO_CLOSEST_PREFER_MINUS =

ZeroRoundingModeClass.new(:ZERO_ROUND_TO_CLOSEST_PREFER_MINUS, 3)

ZERO_ROUND_UNNECESSARY =

ZeroRoundingModeClass.new(:ZERO_ROUND_UNNECESSARY, 4)