Given a number n and a value k, turn on the k’th bit in n.
Examples:
Input: n = 4, k = 2 Output: 6 Input: n = 3, k = 3 Output: 7 Input: n = 64, k = 4 Output: 72 Input: n = 64, k = 5 Output: 80
The idea is to use bitwise << and | operators. Using expression “(1 << (k – 1))“, we get a number which has all bits unset, except the k’th bit. If we do bitwise | of this expression with n, we get a number which has all bits same as n except the k’th bit which is 1.
Below is the implementation of above idea.
C++
// CPP program to turn on a particular bit#include <iostream>using namespace std;// Returns a number that has all bits same as n// except the k'th bit which is made 1int turnOnK(int n, int k){ // k must be greater than 0 if (k <= 0) return n; // Do | of n with a number with all // unset bits except the k'th bit return (n | (1 << (k - 1)));}// Driver program to test above functionint main(){ int n = 4; int k = 2; cout << turnOnK(n, k); return 0;} |
Java
// Java program to turn on a particular// bitclass GFG { // Returns a number that has all // bits same as n except the k'th // bit which is made 1 static int turnOnK(int n, int k) { // k must be greater than 0 if (k <= 0) return n; // Do | of n with a number with // all unset bits except the // k'th bit return (n | (1 << (k - 1))); } // Driver program to test above // function public static void main(String [] args) { int n = 4; int k = 2; System.out.print(turnOnK(n, k)); }}// This code is contributed by Smitha |
Python 3
# Python 3 program to turn on a # particular bit# Returns a number that has all# bits same as n except the k'th# bit which is made 1def turnOnK(n, k): # k must be greater than 0 if (k <= 0): return n # Do | of n with a number # with all unset bits except # the k'th bit return (n | (1 << (k - 1)))# Driver program to test above # functionn = 4k = 2print(turnOnK(n, k))# This code is contributed by# Smitha |
C#
// C# program to turn on a particular// bitusing System;class GFG { // Returns a number that has all // bits same as n except the k'th // bit which is made 1 static int turnOnK(int n, int k) { // k must be greater than 0 if (k <= 0) return n; // Do | of n with a number // with all unset bits except // the k'th bit return (n | (1 << (k - 1))); } // Driver program to test above // function public static void Main() { int n = 4; int k = 2; Console.Write(turnOnK(n, k)); }}// This code is contributed by Smitha |
PHP
<?php// PHP program to turn on a particular bit// Returns a number that has// all bits same as n except // the k'th bit which is made 1function turnOnK($n, $k){ // k must be greater than 0 if ($k <= 0) return $n; // Do | of n with a number with all // unset bits except the k'th bit return ($n | (1 << ($k - 1)));} // Driver Code $n = 4; $k = 2; echo turnOnK($n, $k);// This code is contributed by m_kit?> |
Javascript
<script> // Javascript program to turn on a particular bit // Returns a number that has all // bits same as n except the k'th // bit which is made 1 function turnOnK(n, k) { // k must be greater than 0 if (k <= 0) return n; // Do | of n with a number // with all unset bits except // the k'th bit return (n | (1 << (k - 1))); } let n = 4; let k = 2; document.write(turnOnK(n, k));// This code is contributed by suresh07.</script> |
Output:
6
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