Method ulp

lib/java/lang/Math.java:931–940

Returns the argument's ulp (unit in the last place). The size of a ulp of a double value is the positive distance between this value and the double value next larger in magnitude. For non-NaN x, ulp(-x) == ulp(x). Special cases: ulp(+0.0) = Double.MIN_VALUE

(double d)

     * @return the size of a ulp of the argument.
     */
    public static double ulp(double d) {
        // special cases
        if (Double.isInfinite(d)) {
            return Double.POSITIVE_INFINITY;
        } else if (d == Double.MAX_VALUE || d == -Double.MAX_VALUE) {
            return pow(2, 971);
        }
        d = abs(d);
        return nextafter(d, Double.MAX_VALUE) - d;
    }

    /**
     * Returns the argument's ulp (unit in the last place). The size of a ulp of