# Toggling k-th bit of a number

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
```

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

Below are simple steps to find 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

 ` `

Output :

```4
```

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