Java Math.exp() method

The java.lang.Math.exp() is used to return the Euler's number e raised to the power of a double value. Here, e is an Euler's number and it is approximately equal to 2.718281828459045.

Syntax

Parameter

Return

It returns the value e^x, where e is the base of the natural logarithms.

If the argument is positive or negative double value, this method will return the output.
IIf the argument is Zero, this method will return 1.0.
IIf the argument is Positive Infinity, this method will return Positive Infinity.
IIf the argument is Negative Infinity, this method will return Positive Zero.
IIf the argument is NaN, this method will return NaN.

Example 1

public class ExpExample1
{
    public static void main(String[] args) 
    {
        double a = 2.0;
        // return (2.718281828459045) power of 2
        System.out.println(Math.exp(a));
    }
}

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Output:

7.38905609893065

Example 2

public class ExpExample2
{
    public static void main(String[] args) 
    {
        double a = -7.0;
        // return (2.718281828459045) power of -7
        System.out.println(Math.exp(a));
    }
}

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Output:

9.118819655545162E-4

Example 3

public class ExpExample3
{
    public static void main(String[] args) 
    {
        double a = 0.0;
        // Input Zero, Output 1.0 
        System.out.println(Math.exp(a));
    }
}  

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Output:

1.0

Example 4

public class ExpExample4
{
    public static void main(String[] args) 
    {
        double a = 1.0 / 0;
        // Input positive Infinity, Output positive Infinity
        System.out.println(Math.exp(a));
    }
}

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Output:

Infinity

Example 5

public class ExpExample5
{
    public static void main(String[] args) 
    {
        double a = -1.0 / 0;
        // Input negative Infinity, Output Zero
        System.out.println(Math.exp(a));
    }
}

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Output:

0.0

Example 6

public class ExpExample6
{
    public static void main(String[] args) 
    {
        double a = 0.0 / 0;
        // Input NaN, Output NaN
        System.out.println(Math.exp(a));
    }
}        

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Output: