w3resource

Java Exercises: Find the number of bits required to flip to convert two given integers

Java Basic: Exercise-147 with Solution

Write a Java program to find the number of bits required to flip to convert two given integers.

Example: 27 --> 11011
23--> 10111

Sample Solution:

Java Code:

public class Solution {
    public static void main(String[] args) {
        System.out.println(bitSwapRequired(27, 23));
    }

      public static int bitSwapRequired(int x, int y) {
        int ctr = 0;
        for (int z = x ^ y; z != 0; z = z >>> 1) {
            ctr += z & 1;
        }
        return ctr;
    }
}

Sample Output:

2

Flowchart:

Flowchart: Java exercises: Find the number of bits required to flip to convert two given integers.

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a Java program to convert an sorted array to binary search tree. Maintain minimal height of the tree.
Next: Write a Java program to find the index of the first unique character in a given string, assume that there is at least one unique character in the string.

What is the difficulty level of this exercise?



Java: Tips of the Day

Try and catch:

Java is excellent at catching errors, but it can only recover gracefully if you tell it what to do. The cascading hierarchy of attempting to perform an action in Java starts with try, falls back to catch, and ends with finally. Should the try clause fail, then catch is invoked, and in the end, there's always finally to perform some sensible action regardless of the results. Here's an example:

try {
        cmd = parser.parse(opt, args); 
       
        if(cmd.hasOption("help")) {
                HelpFormatter helper = new HelpFormatter();
                helper.printHelp("Hello ", opt);
                System.exit(0);
                }
        else {
                if(cmd.hasOption("shell") || cmd.hasOption("s")) {
                String target = cmd.getOptionValue("tgt");
                } // else
        } // fi
} catch (ParseException err) {
        System.out.println(err);
        System.exit(1);
        } //catch
        finally {
                new Hello().helloWorld(opt);
        } //finally
} //try

It's a robust system that attempts to avoid irrecoverable errors or, at least, to provide you with the option to give useful feedback to the user. Use it often, and your users will thank you!

Ref: https://red.ht/3EZc9OC