## Kotlin countLeadingZeroBits()

In Kotlin, the `countLeadingZeroBits()`

function is used to count the number of leading zero bits in the binary representation of a number.

This function can be helpful in various bitwise operations and optimizations where knowledge of the number of leading zeros is required.

In this tutorial, we’ll explore the syntax of the `countLeadingZeroBits()`

function and provide examples of its usage in Kotlin.

## Syntax

The syntax of the `countLeadingZeroBits()`

function is:

```
fun Byte.countLeadingZeroBits(): Int
fun Short.countLeadingZeroBits(): Int
fun UInt.countLeadingZeroBits(): Int
fun ULong.countLeadingZeroBits(): Int
fun UByte.countLeadingZeroBits(): Int
fun UShort.countLeadingZeroBits(): Int
fun Int.countLeadingZeroBits(): Int
fun Long.countLeadingZeroBits(): Int
```

The function returns the count of leading zero bits in the binary representation of this value.

## Example

### 1. Basic usage of countLeadingZeroBits()

In this example, we’ll use `countLeadingZeroBits()`

to count the number of leading zero bits for the number `18`

.

**Kotlin Program**

```
fun main() {
val number = 18
val result = number.countLeadingZeroBits()
println("Number of leading zero bits for $number is $result")
}
```

**Output**

`Number of leading zero bits for 18 is 27`

### 2. Using countLeadingZeroBits() for Optimization

In this example, we’ll use `countLeadingZeroBits()`

to optimize the search for the highest bit set in an integer.

**Kotlin Program**

```
fun findHighestBitSet(value: Int): Int {
// If the value is 0, return -1 indicating no bit is set
if (value == 0) return -1
// Calculate the position of the highest bit set using countLeadingZeroBits
return 31 - value.countLeadingZeroBits()
}
fun main() {
val number = 18
val highestBitPosition = findHighestBitSet(number)
println("The highest bit set in $number is at position $highestBitPosition")
}
```

**Output**

`The highest bit set in 18 is at position 4`

In this example, the `countLeadingZeroBits()`

function is used to find the position of the highest bit set in the binary representation of the given integer. The result is then printed.

## Summary

In this tutorial, we’ve covered the `countLeadingZeroBits()`

function in Kotlin, its syntax, and how to use it for counting leading zero bits in the binary representation of an integer. This function can be particularly useful in bitwise operations and optimizations where knowledge of the number of leading zeros is essential.