Java.lang.Math.ulp() Method

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Description

The java.lang.Math.ulp(double d) returns the size of an ulp of the argument. An ulp of a double value is the positive distance between this floating-point value and the double value next larger in magnitude. Note that for non-NaN x, ulp(-x) == ulp(x). Special Cases:

  • If the argument is NaN, then the result is NaN.

  • If the argument is positive or negative infinity, then the result is positive infinity.

  • If the argument is positive or negative zero, then the result is Double.MIN_VALUE.

  • If the argument is ąDouble.MAX_VALUE, then the result is equal to 2971.

Declaration

Following is the declaration for java.lang.Math.ulp() method

public static double ulp(double d)

Parameters

  • d -- the floating-point value whose ulp is to be returned

Return Value

This method returns the size of an ulp of the argument

Exception

  • NA

Example

The following example shows the usage of lang.Math.ulp() method.

package com.tutorialspoint;

import java.lang.*;

public class MathDemo {

   public static void main(String[] args) {

      // get two double numbers numbers
      double x = 956.294;
      double y = 123.1;

      // print the ulp of these doubles
      System.out.println("Math.ulp(" + x + ")=" + Math.ulp(x));
      System.out.println("Math.ulp(" + y + ")=" + Math.ulp(y));

   }
}

Let us compile and run the above program, this will produce the following result:

Math.ulp(956.294)=1.1368683772161603E-13
Math.ulp(123.1)=1.4210854715202004E-14



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