Set the rightmost off bit

Write a program that sets the rightmost 0 bit of an integer.

Examples :

Input:  12 (00...01100)
Output: 13 (00...01101)

Input:  7 (00...00111)
Output: 15 (00...01111)

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

If we add 1 to a number, all set bits after rightmost unset (or zero bit) become 0 and the rightmost unset bit becomes 1.

C++

 // CPP program to set the rightmost unset bit #include using namespace std;       int setRightmostUnsetBit(int n)  {          // If all bits are set       if ((n & (n + 1)) == 0)              return n;               // Set rightmost 0 bit     return n | (n+1);      }       // Driver program to test above  int main()  {      int n = 21;      cout << setRightmostUnsetBit(n);      return 0;  }

Java

 //Java  program to set the rightmost unset bit    public class GFG {        static int setRightmostUnsetBit(int n)      {           // If all bits are set        if ((n & (n + 1)) == 0)               return n;                  // Set rightmost 0 bit      return n | (n+1);          }         //Driver program to test above      public static void main(String[] args) {             int n = 21;           System.out.println(setRightmostUnsetBit(n));      }    }

Python 3

 # Python3 program to set the  # rightmost unset bit     def setRightmostUnsetBit(n) :        # If all bits are set      if n & (n + 1) == 0 :         return n            # Set rightmost 0 bit      return n | (n+1)    # Driver code      if __name__ == "__main__" :        n = 21     print(setRightmostUnsetBit(n))    # This code is contributed # by ANKITRAI1

C#

 // C# program to set the rightmost unset bit    using System;    public class GFG {         static int setRightmostUnsetBit(int n)      {           // If all bits are set        if ((n & (n + 1)) == 0)               return n;                   // Set rightmost 0 bit      return n | (n+1);          }          //Driver program to test above      public static void Main() {              int n = 21;           Console.WriteLine(setRightmostUnsetBit(n));      }     }

PHP



Output:

23

My Personal Notes arrow_drop_up Check out this Author's contributed articles.

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.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.