Set all the bits in given range of a number

Given a non-negative number n and two values l and r. The problem is to set the bits in the range l to r in the binary representation of n, i.e, to unset bits from the rightmost lth bit to the rightmost r-th bit.
Constraint: 1 <= l <= r <= number of bits in the binary representation of n.

Examples :

Input : n = 17, l = 2, r = 3
Output : 23
(17)10 = (10001)2
(23)10 = (10111)2
The bits in the range 2 to 3 in the binary
representation of 17 are set.

Input : n = 50, l = 2, r = 5
Output : 62



Approach: Following are the steps:

1. Find a number 'range' that has all set
   bits in given range. And all other bits
   of this number are 0.
     range = (((1 << (l - 1)) - 1) ^ 
              ((1 << (r)) - 1));

2. Now, perform "n = n | range". This will 
   set the bits in the range from l to r 
   in n.

C++

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// C++ implementation to Set bits in
// the given range
#include <iostream>
using namespace std;
  
// function to toggle bits in the given range
int setallbitgivenrange(int n, int l, int r)
{
    // calculating a number 'range' having set
    // bits in the range from l to r and all other
    // bits as 0 (or unset).
    int range = (((1 << (l - 1)) - 1) ^    
                ((1 << (r)) - 1));
  
    return (n | range);
}
  
// Driver code
int main()
{
    int n = 17, l = 2, r = 3;
    cout << setallbitgivenrange(n, l, r);
    return 0;
}

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Java














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// java implementation to Set bits in 


// the given range 


import java.util.*; 


  


class GFG 


{ 


      


    // function to toggle bits in the  


    // given range 


    static int setallbitgivenrange(int n, 


                             int l, int r) 


    { 


          


        // calculating a number 'range'  


        // having set bits in the range  


        // from l to r and all other 


        // bits as 0 (or unset). 


        int range = (((1 << (l - 1)) - 1) ^  


                    ((1 << (r)) - 1)); 


      


        return (n | range); 


    } 


      


    // Driver code 


    public static void main(String[] args) 


    { 


        int n = 17, l = 2, r = 3; 


          


        System.out.println(setallbitgivenrange( 


                                      n, l, r)); 


    } 


      


} 


  


// This code is contributed by Sam007. 



















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Python3














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# Python3 implementation to Set  


# bits in the given range 


  


# Function to toggle bits 


# in the given range 


def setallbitgivenrange(n, l, r): 


  


    # calculating a number 'range' 


    # having set bits in the range 


    # from l to r and all other 


    # bits as 0 (or unset). 


    range = (((1 << (l - 1)) - 1) ^  


                ((1 << (r)) - 1)) 


  


    return (n | range) 


  


# Driver code 


n, l, r = 17, 2, 3


print(setallbitgivenrange(n, l, r)) 


  


# This code is contributed by Anant Agarwal. 



















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C#














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// C# implementation to Set  


// bits in the given range 


using System; 


  


class GFG 


{ 


    // function to toggle bits  


    // in the given range 


    static int setallbitgivenrange(int n, int l, int r) 


    { 


          


        // calculating a number 'range'  


        // having set bits in the range  


        // from l to r and all other 


        // bits as 0 (or unset). 


        int range = (((1 << (l - 1)) - 1) ^  


                     ((1 << (r)) - 1)); 


      


        return (n | range); 


    } 


      


    // Driver code 


    static void Main() 


    { 


        int n = 17, l = 2, r = 3; 


        Console.Write(setallbitgivenrange(n, l, r)); 


    } 


      


} 


  


// This code is contributed by Sam007 



















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PHP














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<?php 


// PHP implementation to Set  


// bits in the given range 


  


// function to toggle bits 


// in the given range 


function setallbitgivenrange($n, $l, $r) 


{ 


    // calculating a number 'range' 


    // having set bits in the range  


    // from l to r and all other 


    // bits as 0 (or unset). 


    $range = (((1 << ($l - 1)) - 1) ^  


                  ((1 << ($r)) - 1)); 


  


    return ($n | $range); 


} 


  


// Driver code 


$n = 17; 


$l = 2; 


$r = 3; 


echo setallbitgivenrange($n, $l, $r); 


  


// This code is contributed by Sam007 


?> 



















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Output :


23






This article is contributed by Devanshu Agarwal. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.


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