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 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<iostream> ` `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; ` `} ` |

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## 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)); ` ` ` `} ` `} ` |

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## 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". ` |

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## 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. ` |

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## PHP

`<?php ` `// Php program to toggle k-th bit of n ` ` ` `function` `toggleKthBit(` `$n` `, ` `$k` `) ` `{ ` ` ` `return` `(` `$n` `^ (1 << (` `$k` `- 1))); ` `} ` ` ` `// Driver code ` `$n` `= 5; ` `$k` `= 1; ` `echo` `toggleKthBit(` `$n` `, ` `$k` `); ` ` ` `// This code is contributed by Ajit ` `?> ` |

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**Output :**

4

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