# Java.lang.Math.exp() Method

## Description

The java.lang.Math.exp(double a) returns Euler's number e raised to the power of a double value. Special cases:

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

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

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

The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.

## Declaration

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

```public static double exp(double a)
```

## Parameters

a − the exponent to raise e to.

## Return Value

This method returns the value ea, where e is the base of the natural logarithms.

NA

## Example

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

```package com.tutorialspoint;

import java.lang.*;

public class MathDemo {

public static void main(String[] args) {

// get two double numbers
double x = 5;
double y = 0.5;

// print e raised at x and y
System.out.println("Math.exp(" + x + ")=" + Math.exp(x));
System.out.println("Math.exp(" + y + ")=" + Math.exp(y));
}
}
```

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

```Math.exp(5)=148.4131591025766
Math.exp(0.5)=1.6487212707001282
```
java_lang_math.htm