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# Toggling k-th bit of a number

• Difficulty Level : Easy
• Last Updated : 23 Apr, 2021

For a given number n, if k-th bit is 0, then toggle it to 1 and if it is 1 then, toggle it to 0.
Examples :

```Input : n = 5, k = 1
Output : 4
5 is represented as 101 in binary
and has its first bit 1, so toggling
it will result in 100 i.e. 4.

Input : n = 2, k = 3
Output : 6

Input : n = 75, k = 4
Output : 67```

Below are simple steps to find the value of k-th bit

```1) Left shift given number 1 by k-1 to create
a number that has only set bit as k-th bit.
temp = 1 << (k-1)
2) Return bitwise XOR of temp and n.  Since temp
has only k-th bit set, doing XOR would toggle
only this bit.```

Example :

``` n = 75 and k = 4
temp = 1 << (k-1) = 1 << 3 = 8
Binary Representation of temp = 0..00001000
Binary Representation of n = 0..01001011
Bitwise XOR of two numbers = 0..01000011```

## C++

 `// CPP program to toggle k-th bit of n``#include``using` `namespace` `std;` `int` `toggleKthBit(``int` `n, ``int` `k)``{``    ``return` `(n ^ (1 << (k-1)));``}` `// Driver code``int` `main()``{``    ``int` `n = 5, k = 1;``    ``cout << toggleKthBit(n , k);``    ``return` `0;``}`

## Java

 `// Java program to toogle``// k-th bit of a number` `class` `Toggle``{``    ``static` `int` `toggleKthBit(``int` `n, ``int` `k)``    ``{``        ``return` `(n ^ (``1` `<< (k-``1``)));``    ``}``    ` `    ``// main function``    ``public` `static` `void` `main (String[] args)``    ``{  ``        ``int` `n = ``5``, k = ``1``;``        ``System.out.println(toggleKthBit(n , k));``    ``}``}`

## Python3

 `# Python3 code to toggle k-th bit of n` `def` `toggleKthBit(n, k):``    ``return` `(n ^ (``1` `<< (k``-``1``)))``    ` `# Driver code``n ``=` `5``k ``=` `1``print``( toggleKthBit(n , k))` `# This code is contributed by "Sharad_Bhardwaj".`

## C#

 `// C# program to toogle``// k-th bit of a number``using` `System;` `class` `GFG {``    ` `    ``static` `int` `toggleKthBit(``int` `n, ``int` `k)``    ``{``        ``return` `(n ^ (1 << (k-1)));``    ``}``     ` `    ``// main function``    ``public` `static` `void` `Main()``    ``{  ``        ``int` `n = 5, k = 1;``        ` `        ``Console.WriteLine(toggleKthBit(n , k));``    ``}``}` `//This code is contributed by Anant Agarwal.`

## PHP

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## Javascript

 ``

Output :

`4`

This article is contributed by SAKSHI TIWARI. If you like GeeksforGeeks(We know you do!) 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.