# Program to clear 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 1, then clear it to 0 and if it is 0 then leave it unchanged.

Examples:

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

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

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

Approach:

• Since bitwise AND of any bit with a reset bit results in a reset bit, i.e.
```Any bit <bitwise AND> Reset bit = Reset bit

which means,
0 & 0 = 0
1 & 0 = 0
```
• So for clearing a bit, performing a bitwise AND 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 clear K-th bit of a number N ` ` `  `#include ` ` `  `// Function to clear the kth bit of n ` `int` `clearBit(``int` `n, ``int` `k) ` `{ ` `    ``return` `(n & (~(1 << (k - 1)))); ` `} ` ` `  `// Driver code ` `int` `main() ` `{ ` `    ``int` `n = 5, k = 1; ` ` `  `    ``printf``(``"%d\n"``, clearBit(n, k)); ` ` `  `    ``return` `0; ` `} `

## Python3

 `# Python3 program to clear ` `# K-th bit of a number N ` ` `  `# Function to clear the kth bit of n ` `def` `clearBit(n, k): ` `    ``return` `(n & ( ~(``1` `<< (k ``-` `1``)))) ` ` `  `# Driver code ` `n ``=` `5` `k ``=` `1` ` `  `print``(clearBit(n, k)) ` ` `  `# This code is contributed  ` `# by Mohit Kumar `

## Java

 `// Java program to clear K-th bit of a number N  ` `class` `GFG  ` `{ ` `     `  `    ``// Function to clear the kth bit of n  ` `    ``static` `int` `clearBit(``int` `n, ``int` `k)  ` `    ``{  ` `        ``return` `(n & (~(``1` `<< (k - ``1``))));  ` `    ``}  ` `     `  `    ``// Driver code  ` `    ``public` `static` `void` `main (String[] args)  ` `    ``{  ` `        ``int` `n = ``5``, k = ``1``;  ` `     `  `        ``System.out.println(clearBit(n, k));  ` `    ``}  ` `} ` ` `  `// This code is contributed by AnkitRai01 `

## C#

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

Output:

```4
```

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