# Java.lang.StrictMath.ulp() Method

## Description

The java.lang.StrictMath.ulp(double d) method 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. For non-NaN x, ulp(-x) == ulp(x).It include these 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.StrictMath.ulp() method

```public static double ulp(double d)
```

## Parameters

d − This is 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 java.lang.StrictMath.ulp() method.

```package com.tutorialspoint;

import java.lang.*;

public class StrictMathDemo {

public static void main(String[] args) {

double d1 = 5.5 , d2 = -2.9, d3 = 0.0;

// returns the size of an ulp of the argument
double ulpValue = StrictMath.ulp(d1);
System.out.println("Size of ulp of " + d1 + " = " + ulpValue);

ulpValue = StrictMath.ulp(d2);
System.out.println("Size of ulp of " + d2 + " = " + ulpValue);

ulpValue = StrictMath.ulp(d3);
System.out.println("Size of ulp of " + d3 + " = " + ulpValue);
}
}
```

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

```Size of ulp of 5.5 = 8.881784197001252E-16
Size of ulp of -2.9 = 4.440892098500626E-16
Size of ulp of 0.0 = 4.9E-324
```
java_lang_strictmath.htm
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