# Program to toggle K-th bit of a number N

Given a number N, the task is to clear the K-th bit of this number N. If K-th bit is 0, then set it to 1 and if it is 1 then set it to 0.

Examples:

```Input: N = 5, K = 2
Output: 7
5 is represented as 101 in binary
and has its second bit 0, so toggling
it will result in 111 i.e. 7.

Input: N = 5, K = 1
Output: 4
5 is represented as 101 in binary
and has its first bit is 1, so toggling
it will result in 100 i.e. 4.
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach:

• Since XOR of unset and set bit results in a set bit and XOR of a set and set bit results in an unset bit. Hence performing bitwise XOR of any bit with a set bit results in toggle of that bit, i.e.
```Any bit <bitwise XOR> Set bit = Toggle

which means,
0 ^ 1 = 1
1 ^ 1 = 0
```
• So in order to toggle a bit, performing a bitwise XOR of the number with a reset bit is the best idea.
```n = n ^ 1 << k
OR
n ^= 1 << k

where k is the bit that is to be cleared
```

Below is the implementation of the above approach:

## C

 `// C program to toggle K-th bit of a number N ` ` `  `#include ` ` `  `// Function to toggle the kth bit of n ` `int` `toggleBit(``int` `n, ``int` `k) ` `{ ` `    ``return` `(n ^ (1 << (k - 1))); ` `} ` ` `  `// Driver code ` `int` `main() ` `{ ` `    ``int` `n = 5, k = 2; ` ` `  `    ``printf``(``"%d\n"``, toggleBit(n, k)); ` ` `  `    ``return` `0; ` `} `

## Java

 `// Java program to toggle K-th bit of a number N ` `class` `GFG ` `{ ` ` `  `// Function to toggle the kth bit of n ` `static` `int` `toggleBit(``int` `n, ``int` `k) ` `{ ` `    ``return` `(n ^ (``1` `<< (k - ``1``))); ` `} ` ` `  `// Driver code ` `public` `static` `void` `main(String []args) ` `{ ` `    ``int` `n = ``5``, k = ``2``; ` ` `  `    ``System.out.printf(``"%d\n"``, toggleBit(n, k)); ` `} ` `} ` ` `  `// This code is contributed by Rajput-Ji `

## Python3

 `# Python3 program to clear K-th bit  ` `# of a number N  ` ` `  `# Function to toggle the kth bit of n  ` `def` `toggleBit(n, k) : ` ` `  `    ``return` `(n ^ (``1` `<< (k ``-` `1``)));  ` ` `  `# Driver code  ` `if` `__name__ ``=``=` `"__main__"` `:  ` ` `  `    ``n ``=` `5``; k ``=` `2``;  ` ` `  `    ``print``(toggleBit(n, k)); ` ` `  `# This code is contributed by AnkitRai01 `

## C#

 `// C# program to toggle K-th bit of a number N ` `using` `System;  ` ` `  `class` `GFG ` `{ ` ` `  `// Function to toggle the kth bit of n ` `static` `int` `toggleBit(``int` `n, ``int` `k) ` `{ ` `    ``return` `(n ^ (1 << (k - 1))); ` `} ` ` `  `// Driver code ` `public` `static` `void` `Main(String []args) ` `{ ` `    ``int` `n = 5, k = 2; ` ` `  `    ``Console.WriteLine(``"{0}"``, toggleBit(n, k)); ` `} ` `} ` ` `  `// This code is contributed by PrinciRaj1992 `

Output:

```7
```

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