# 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
```

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