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# Set the rightmost off bit

• Last Updated : 05 Apr, 2021

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)```

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

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## Javascript

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Output:
`23`

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