Toggle all odd bits of a number

Last Updated : 27 May, 2022

Given n number, the task is to toggle odd bit of the number.
Examples:

Input : 10
Output : 15
binary representation 1 0 1 0
after toggle          1 1 1 1 

Input : 20
Output : 1
binary representation 1 0 1 0 0
after toggle          0 0 0 0 1

1. First generate a number that contains odd position bits.
2. Take XOR with the original number. Note that 1 ^ 1 = 0 and 1 ^ 0 = 1.
Let’s understand this approach with below code.

C++

// Toggle all odd bit of a number
#include <iostream>
using namespace std;
 
// Returns a number which has all odd
// bits of n toggled.
int evenbittogglenumber(int n)
{
    // Generate number form of 101010...
    // ..till of same order as n
    int res = 0, count = 0;
    for (int temp = n; temp > 0; temp >>= 1) {
 
        // if bit is odd, then generate
        // number and or with res
        if (count % 2 == 0)
            res |= (1 << count);      
 
        count++;
    }
 
    // return toggled number
    return n ^ res;
}
 
// Driver code
int main()
{
    int n = 11;
    cout << evenbittogglenumber(n);
    return 0;
}

Java

// Toggle all odd bit of a number

import java.io.*;

class GFG {
    // Returns a number which has all odd
    // bits of n toggled.
    static int evenbittogglenumber(int n)
    {
        // Generate number form of 101010...
        // ..till of same order as n
        int res = 0, count = 0;
        for (int temp = n; temp > 0; temp >>= 1) {
      
            // if bit is odd, then generate
            // number and or with res
            if (count % 2 == 0)
                res |= (1 << count);      
      
            count++;
        }
      
        // return toggled number
        return n ^ res;
    }
      
    // Driver code
    public static void main(String args[])
    {
        int n = 11;
        System.out.println(evenbittogglenumber(n));
    }
}

/*This code is contributed by Nikita tiwari.*/

Python3

# Python3 code for Toggle all odd bit of a number

# Returns a number which has all odd
# bits of n toggled.
def evenbittogglenumber(n) :
    
    # Generate number form of 101010...
    # ..till of same order as n
    res = 0; count = 0; temp = n
    
    while(temp > 0 ) :
        
        # If bit is odd, then generate
        # number and or with res
        if (count % 2 == 0) :
            res = res | (1 << count)     

        count = count + 1
        temp >>= 1
    
    
    # Return toggled number
    return n ^ res
    

# Driver code
if __name__ == '__main__' :
    
    n = 11
    print(evenbittogglenumber(n))


# This code is contributed by Nikita Tiwari.

// C# code for Toggle all odd bit of a number
using System;

class GFG {
    
    // Returns a number which has all odd
    // bits of n toggled.
    static int evenbittogglenumber(int n)
    {
        
        // Generate number form of 101010...
        // ..till of same order as n
        int res = 0, count = 0;
        
        for (int temp = n; temp > 0; temp >>= 1)
        {
       
            // if bit is odd, then generate
            // number and or with res
            if (count % 2 == 0)
                res |= (1 << count);      
       
            count++;
        }
       
        // return toggled number
        return n ^ res;
    }
       
    // Driver code
    public static void Main()
    {
        
        int n = 11;
        
        Console.WriteLine(evenbittogglenumber(n));
    }
}
 
// This code is contributed by Anant Agarwal.

PHP

<?php
// php implementation of Toggle
// all odd bit of a number

// Returns a number which has 
// all odd bits of n toggled.
function evenbittogglenumber($n)
{
    
    // Generate number form of 101010...
    // ..till of same order as n
    $res = 0;
    $count = 0;
    for ($temp = $n; $temp > 0; $temp >>= 1) 
    {

        // if bit is odd, then generate
        // number and or with res
        if ($count % 2 == 0)
            $res |= (1 << $count);     

        $count++;
    }

    // return toggled number
    return $n ^ $res;
}

    // Driver code
    $n = 11;
    echo evenbittogglenumber($n);

// This code is contributed by mits 
?>

JavaScript

<script>

// JavaScript program Toggle all odd bit of a number
 
    // Returns a number which has all odd
    // bits of n toggled.
    function evenbittogglenumber(n)
    {
        // Generate number form of 101010...
        // ..till of same order as n
        let res = 0, count = 0;
        for (let temp = n; temp > 0; temp >>= 1) {
        
            // if bit is odd, then generate
            // number and or with res
            if (count % 2 == 0)
                res |= (1 << count);      
        
            count++;
        }
        
        // return toggled number
        return n ^ res;
    }

// Driver code
        
        let n = 11;
        document.write(evenbittogglenumber(n));
                  
</script>

Output :

Time Complexity : O(log n)

Space Complexity : O(1)

Set all odd bits of a number

devanshuagarwal

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Toggle all odd bits of a number

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