# Java StrictMath expm1() Method with Example

StrictMath Class expm1() method: Here, we are going to learn about the expm1() method of StrictMath Class with its syntax and example.
Submitted by Preeti Jain, on January 05, 2020

## StrictMath Class expm1() method

• expm1() Method is available in java.lang package.
• expm1() Method is used to return [ the exponential of the given number – 1] in the method or in other words it is used to calculate the ( e raised to the power of the given argument – 1). Here, "expm" stands for exponentiation.
• expm1() Method is a static method so it is accessible with the class name and if we try to access the method with the class object then we will not get any error.
• expm1() Method does not throw any exception.

Syntax:

```    public static double expm1(double d);
```

Parameter(s):

• double d – represents the exponent to raise the power of e-1.

Return value:

The return type of the method is double, it returns (The exponentiation of the given argument -1).

Note:

• If we pass NaN, the method returns the NaN.
• If we pass positive infinity, the method returns the same (positive infinity).
• If we pass negative infinity, the method returns -1.0.
• If we pass zero, the method returns the same value with the same sign.

Example:

```// Java program to demonstrate the example
// of expm1(double d) method of StrictMath Class.

public class Expm1 {
public static void main(String[] args) {
// variable declarations
double d1 = 7.0 / 0.0;
double d2 = -7.0 / 0.0;
double d3 = 0.0;
double d4 = -0.0;
double d5 = 0.8;
double d6 = 2;

// Display previous value of d1,d2,d3, d4,d5 and d6
System.out.println(" d1: " + d1);
System.out.println(" d2: " + d2);
System.out.println(" d3: " + d3);
System.out.println(" d4: " + d4);
System.out.println(" d5: " + d5);
System.out.println(" d6: " + d6);

// Here , we will get (Infinity) because we are
// passing parameter whose value is (infinity)
System.out.println("StrictMath.expm1(d1): " + StrictMath.expm1(d1));

// Here , we will get (-1.0) because we are
// passing parameter whose value is (-infinity)
System.out.println("StrictMath.expm1(d2): " + StrictMath.expm1(d2));

// Here , we will get (0.0) because we are
// passing parameter whose value is (0.0)
System.out.println("StrictMath.expm1(d3): " + StrictMath.expm1(d3));

// Here , we will get (-0.0) because we are
// passing parameter whose value is (-0.0)
System.out.println("StrictMath.expm1(d4): " + StrictMath.expm1(d4));

// Here , we will get [(e raised to the power of 0.8) - 1] because we are
// passing parameter whose value is (0.8)
System.out.println("StrictMath.expm1(d5): " + StrictMath.expm1(d5));

// Here , we will get [(e raised to the power of 2) - 1] because we are
// passing parameter whose value is (2)
System.out.println("StrictMath.expm1(d6): " + StrictMath.expm1(d6));
}
}
```

Output

``` d1: Infinity
d2: -Infinity
d3: 0.0
d4: -0.0
d5: 0.8
d6: 2.0
StrictMath.expm1(d1): Infinity
StrictMath.expm1(d2): -1.0
StrictMath.expm1(d3): 0.0
StrictMath.expm1(d4): -0.0
StrictMath.expm1(d5): 1.2255409284924677
StrictMath.expm1(d6): 6.38905609893065
```

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