# Java.lang.Math.ulp() Method

## 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 Double.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

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
```
java_lang_math.htm