# Set the K-th bit of a given number

Given a number n and a value k. From the right, set the kth bit in the binary representation of n. The position of LSB(or last bit) is 0, second last bit is 1 and so on. Also, 0 <= k < x, where x is the number of bits in the binary representation of n.**Examples:**

Input : n = 10, k = 2 Output : 14(10)= (1010)_{10}_{2}Now, set the 2nd bit from right.(14)= (1_{10}110)_{2}2nd bit has been set. Input : n = 15, k = 3 Output : 15 3rd bit of 15 is already set.

To set any bit we use bitwise OR | operator. As we already know bitwise OR | operator evaluates each bit of the result to 1 if any of the operand’s corresponding bit is set (1). In-order to set kth bit of a number we need to shift 1 k times to its left and then perform bitwise OR operation with the number and result of left shift performed just before.

In general,(1 << k) | n.

## C++

`// C++ implementation to set the kth bit` `// of the given number` `#include <bits/stdc++.h>` `using` `namespace` `std;` `// function to set the kth bit` `int` `setKthBit(` `int` `n, ` `int` `k)` `{` ` ` `// kth bit of n is being set by this operation` ` ` `return` `((1 << k) | n);` `}` `// Driver program to test above` `int` `main()` `{` ` ` `int` `n = 10, k = 2;` ` ` `cout << ` `"Kth bit set number = "` ` ` `<< setKthBit(n, k);` ` ` `return` `0;` `}` |

## Java

`// Java implementation to set the kth bit` `// of the given number` `class` `GFG {` ` ` `// function to set the kth bit` `static` `int` `setKthBit(` `int` `n, ` `int` `k)` `{` ` ` `// kth bit of n is being set by this operation` ` ` `return` `((` `1` `<< k) | n);` `}` `// Driver code` `public` `static` `void` `main(String arg[])` `{` ` ` `int` `n = ` `10` `, k = ` `2` `;` ` ` `System.out.print(` `"Kth bit set number = "` `+` ` ` `setKthBit(n, k));` `}` `}` `// This code is contributed by Anant Agarwal.` |

## Python3

`# Python implementation` `# to set the kth bit` `# of the given number` `# function to set` `# the kth bit` `def` `setKthBit(n,k):` ` ` `# kth bit of n is being` ` ` `# set by this operation` ` ` `return` `((` `1` `<< k) | n)` ` ` `# Driver code` `n ` `=` `10` `k ` `=` `2` `print` `(` `"Kth bit set number = "` `,` ` ` `setKthBit(n, k))` `# This code is contributed` `# by Anant Agarwal.` |

## C#

`// C# implementation to set the` `// kth bit of the given number` `using` `System;` `class` `GFG {` ` ` `// function to set the kth bit` `static` `int` `setKthBit(` `int` `n, ` `int` `k)` `{` ` ` `// kth bit of n is being set` ` ` `// by this operation` ` ` `return` `((1 << k) | n);` `}` `// Driver code` `public` `static` `void` `Main()` `{` ` ` `int` `n = 10, k = 2;` ` ` `Console.Write(` `"Kth bit set number = "` ` ` `+ setKthBit(n, k));` ` ` `}` `}` `// This code is contributed by` `// Smitha Dinesh Semwal.` |

## PHP

`<?php` `// PHP implementation to` `// set the kth bit of` `// the given number` `// function to set` `// the kth bit` `function` `setKthBit(` `$n` `, ` `$k` `)` `{` ` ` `// kth bit of n is being` ` ` `// set by this operation` ` ` `return` `((1 << ` `$k` `) | ` `$n` `);` `}` `// Driver Code` `$n` `= 10; ` `$k` `= 2;` `echo` `"Kth bit set number = "` `,` ` ` `setKthBit(` `$n` `, ` `$k` `);` `// This code is contributed by m_kit` `?>` |

## Javascript

`<script>` ` ` `// Javascript implementation to set the` ` ` `// kth bit of the given number` ` ` ` ` `// function to set the kth bit` ` ` `function` `setKthBit(n, k)` ` ` `{` ` ` `// kth bit of n is being set` ` ` `// by this operation` ` ` `return` `((1 << k) | n);` ` ` `}` ` ` ` ` `let n = 10, k = 2;` ` ` `document.write(` `"Kth bit set number = "` `+ setKthBit(n, k));` ` ` ` ` `// This code is contributed by rameshtravel07.` `</script>` |

**Output:**

Kth bit set number = 14

This article is contributed by **Ayush Jauhari**. If you like GeeksforGeeks 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.

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