# Java Math - scalb() Method

The Java scalb() method returns a x 2b. If the exponent of the result is between Double.MIN_EXPONENT/Float.MIN_EXPONENT and Double.MAX_EXPONENT/Float.MAX_EXPONENT, the result is calculated exactly. In special cases it returns the following:

• If the first argument is NaN, NaN is returned.
• If the first argument is infinite, then an infinity of the same sign is returned.
• If the first argument is zero, then a zero of the same sign is returned.

### Syntax

```public static double scalb(double a, int b)
public static float scalb(float a, int b)
```

### Parameters

 `a` Specify value to be scaled by power of 2. `b` Specify power of 2 used to scale a.

Returns a x 2b.

NA.

### Example:

In the example below, scalb() method returns a x 2b.

```public class MyClass {
public static void main(String[] args) {
System.out.println(Math.scalb(2.55, 4));
System.out.println(Math.scalb(10, 3));
}
}
```

The output of the above code will be:

```40.8
80.0
```

❮ Java Math Methods

5