切换数字的第k位

对于给定的数字n，如果第k位为0，则将其切换为1，如果为1，则将其切换为0。
例子 ：

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

以下是查找第k位值的简单步骤

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.

例子 ：

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
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.

Javascript

 
    // 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));
     

输出 ：

4