class Rational - bigdecimal-1.2.7 Documentation

# class Rational

BigDecimal extends the native Rational class to provide the to_d method.

When you require BigDecimal in your application, this method will be available on Rational objects.

### Public Instance Methods

to_d(precision) → bigdecimal click to toggle source

Converts a Rational to a BigDecimal.

The required `precision` parameter is used to determine the amount of significant digits for the result. See BigDecimal#div for more information, as it is used along with the denominator and the `precision` for parameters.

    r = (22/7.0).to_r
    # => (7077085128725065/2251799813685248)
    r.to_d(3)
    # => #<BigDecimal:1a44d08,'0.314E1',18(36)>

    # File lib/bigdecimal/util.rb, line 120
    def to_d(precision)
      if precision <= 0
        raise ArgumentError, "negative precision"
      end
      num = self.numerator
      BigDecimal(num).div(self.denominator, precision)
    end