java.lang.Long numberOfLeadingZeros(long i)
Description
Note that this method is closely related to the logarithm base 2. For all positive long values x:
floor(log2(x)) = 63 - numberOfLeadingZeros(x)
ceil(log2(x)) = 64 - numberOfLeadingZeros(x - 1)
Make a note that the numberOfLeadingZeros() method of Long class is static thus it should be accessed statically which means the we would be calling this method in this format:
Long.numberOfLeadingZeros(method args)
Non static method is usually called by just declaring method_name(argument) however in this case since the method is static, it should be called by appending the class name as suffix. We will be encountering a compilation problem if we call the java numberOfLeadingZeros method non statically.
Method Syntax
public static int numberOfLeadingZeros(long i)
Method Argument
| Data Type | Parameter | Description |
|---|---|---|
| long | i | the value whose number of leading zeros is to be computed |
Method Returns
The numberOfLeadingZeros(long i) method of Long class returns the number of zero bits preceding the highest-order (“leftmost”) one-bit in the two’s complement binary representation of the specified long value, or 64 if the value is equal to zero.
Compatibility
Requires Java 1.5 and up
Java Long numberOfLeadingZeros(long i) Example
Below is a simple java example on the usage of numberOfLeadingZeros(long i) method of Long class.
package com.javatutorialhq.java.examples;
import java.util.Scanner;
/*
* This example source code demonstrates the use of
* numberOfLeadingZeros(long i) method of Long class
*/
public class LongNumberOfLeadingZerosExample {
public static void main(String[] args) {
// Ask for user input
System.out.print("Enter a value:");
// declare a scanner object to read the user input
Scanner s = new Scanner(System.in);
// assign the input to a variable
long value = s.nextLong();
// get the numberOfLeadingZeros() method result
int result = Long.numberOfLeadingZeros(value);
// print the result
System.out.println("Result:" + result);
// close the scanner object
s.close();
}
}
Sample Output
Below is the sample output when you run the above example.
