Turn off the rightmost set bit
Write a program that unsets the rightmost set bit of an integer.
Examples :
Input: 12 (00...01100) Output: 8 (00...01000) Input: 7 (00...00111) Output: 6 (00...00110)
Let the input number be n. n-1 would have all the bits flipped after the rightmost set bit (including the set bit). So, doing n&(n-1) would give us the required result.
C++
#include <bits/stdc++.h> using namespace std; // unsets the rightmost set bit // of n and returns the result int fun(unsigned int n) { return n & (n - 1); } // Driver Code int main() { int n = 7; cout<<"The number after unsetting the"; cout<<" rightmost set bit "<<fun(n); return 0; } //This code is contributed by rathbhupendra |
C
#include <stdio.h> // unsets the rightmost set bit // of n and returns the result int fun(unsigned int n) { return n & (n - 1); } // Driver Code int main() { int n = 7; printf("The number after unsetting the"); printf(" rightmost set bit %d", fun(n)); return 0; } |
Java
// Java program to unset the // rightmost set bit of an integer. class GFG { /* unsets the rightmost set bit of n and returns the result */ static int fun(int n) { return n & (n - 1); } // Driver code public static void main(String arg[]) { int n = 7; System.out.print("The number after unsetting " + "the rightmost set bit " + fun(n)); } } // This code is contributed by Anant Agarwal. |
Python3
# unsets the rightmost set bit # of n and returns the result def fun(n): return n & (n-1) # Driver code n = 7print("The number after unsetting the rightmost set bit", fun(n)) # This code is contributed # by Anant Agarwal. |
C#
// C# program to unset the // rightmost set bit of an integer. using System; class GFG { /* unsets the rightmost set bit of n and returns the result */ static int fun(int n) { return n & (n - 1); } // Driver code public static void Main() { int n = 7; Console.Write("The number after unsetting " + "the rightmost set bit " + fun(n)); } } // This code is contributed by Sam007 |
PHP
<?php // unsets the rightmost set bit // of n and returns the result function fun($n) { return $n & ($n - 1); } // Driver Code $n = 7; echo "The number after unsetting the". " rightmost set bit ", fun($n); // This code is contributed by vt_m. ?> |
Output :
The number after unsetting the rightmost set bit 6
Please write comments if you find the above code/algorithm incorrect, or find better ways to solve the same problem
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