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Turn off the rightmost set bit
• Difficulty Level : Medium
• Last Updated : 19 Mar, 2021

Write a program that unsets the rightmost set bit of an integer.
Examples :

```Input:  12 (00...01100)
Output: 8 (00...01000)

Input:  7 (00...00111)
Output: 6 (00...00110)```

Let the input number be n. n-1 would have all the bits flipped after the rightmost set bit (including the set bit). So, doing n&(n-1) would give us the required result.

## C++

 `#include ``using` `namespace` `std;` `// unsets the rightmost set bit``// of n and returns the result``int` `fun(unsigned ``int` `n)``{``    ``return` `n & (n - 1);``}` `// Driver Code``int` `main()``{``    ``int` `n = 7;``    ``cout<<``"The number after unsetting the"``;``    ``cout<<``" rightmost set bit "``<

## C

 `#include ` `// unsets the rightmost set bit``// of n and returns the result``int` `fun(unsigned ``int` `n)``{``    ``return` `n & (n - 1);``}` `// Driver Code``int` `main()``{``    ``int` `n = 7;``    ``printf``(``"The number after unsetting the"``);``    ``printf``(``" rightmost set bit %d"``, fun(n));``    ``return` `0;``}`

## Java

 `// Java program to unset the``// rightmost set bit of an integer.` `class` `GFG {` `    ``/* unsets the rightmost set bit``     ``of n and returns the result */``    ``static` `int` `fun(``int` `n)``    ``{``        ``return` `n & (n - ``1``);``    ``}` `    ``// Driver code``    ``public` `static` `void` `main(String arg[])``    ``{``        ``int` `n = ``7``;``        ``System.out.print(``"The number after unsetting "``                         ``+ ``"the rightmost set bit "` `+ fun(n));``    ``}``}` `// This code is contributed by Anant Agarwal.`

## Python3

 `# unsets the rightmost set bit``# of n and returns the result``def` `fun(n):` `     ``return` `n & (n``-``1``)` `# Driver code` `n ``=` `7``print``(``"The number after unsetting the rightmost set bit"``, fun(n))` `# This code is contributed``# by Anant Agarwal.`

## C#

 `// C# program to unset the``// rightmost set bit of an integer.``using` `System;` `class` `GFG {` `    ``/* unsets the rightmost set bit``    ``of n and returns the result */``    ``static` `int` `fun(``int` `n)``    ``{``        ``return` `n & (n - 1);``    ``}` `    ``// Driver code``    ``public` `static` `void` `Main()``    ``{``        ``int` `n = 7;``        ``Console.Write(``"The number after unsetting "``                      ``+ ``"the rightmost set bit "` `+ fun(n));``    ``}``}` `// This code is contributed by Sam007`

## Javascript

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## PHP

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Output :

`The number after unsetting the rightmost set bit 6`

Please write comments if you find the above code/algorithm incorrect, or find better ways to solve the same problem

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