# 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

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<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;` `}` |

## 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

`<?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` `?>` |

## Javascript

`<script>` ` ` `// Javascript program to toogle` ` ` `// k-th bit of a number` ` ` ` ` `function` `toggleKthBit(n, k)` ` ` `{` ` ` `return` `(n ^ (1 << (k-1)));` ` ` `}` ` ` ` ` `let n = 5, k = 1;` ` ` ` ` `document.write(toggleKthBit(n , k));` ` ` `</script>` |

**Output :**

4

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