# Behavior for rendering and rounding fractions with respect to a denominator.
# Two methods are added to the Numeric class.
#
# with_fraction is an alternative to to_s that renders a value as a string
# with a whole number and any decimal part as a fraction.
#
# round_to_nearest rounds a value such that a fractional part with the given
# denominator will have integer as its numerator.

# Behavior added to Numeric by eymiha_math
class Numeric

  # Renders a numeric value as a whole number and a fraction with a given
  # denominator, separated with a given separator, and optionally showing
  # fractions with a numerator of zero.
  def with_fraction(denominator=1,separator='-',show_zero=false)
    sign = self <=> 0
    unsigned = self*sign
    whole = (((unsigned*denominator).round)/denominator).floor
    numerator = ((unsigned-whole)*denominator).round
    "#{sign*whole}#{(numerator != 0)||show_zero ?
        "#{separator}#{numerator}/#{denominator}" : ""}"
  end

  # Returns a numeric value such that any remainder is evenly divided by
  # the given denominator.
  def round_to_nearest(denominator=1)
    ((self*denominator).round)/(1.0*denominator)
  end

end