Added clear-ith-bit.md

docs/bit-manipulation/clear-ith-Bit.md

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+---
+id: clear-ith-bit
+tittle: Clear ith Bit
+sidebar-level: Clear ith Bit
+sidebar-position: 2
+Description: Clearing the i-th bit in a number is a nifty bit manipulation technique. This involves setting the i-th bit to 0, leaving all other bits unchanged.
+tags: [dsa, bit manipulation, clear bits]
+---
+
+# Description
+
+Clearing the i-th bit in a number is a common bit manipulation technique. This operation involves setting the i-th bit to 0 while leaving all other bits unchanged.
+
+## Steps to Clear the i-th Bit
+**1. Create a Mask:** Create a number that has all bits set to 1 except for the i-th bit, which is set to 0.
+
+**2. AND Operation:** Perform a bitwise AND between the original number and the mask. This will clear the i-th bit while keeping all other bits unchanged.
+
+## Formula 
+> `mask =∼ (1<<𝑖)`
+
+> `result = num&mask`
+
+
+# Code in Java
+```java
+import java.util.*;
+
+public class clearIthBit {
+
+	public static int clearIthBit(int n, int i) {
+		int bitMask = ~(1<<i);
+		return n & bitMask;
+	}
+	public static void main(String[] args) {
+		System.out.println(clearIthBit(10, 1));
+	}
+}
+```
+
+# Explanation:
+• **Create Mask:** The mask `~(1 << i)` flips all bits of `1 << i`. For i = 2, `1 << 2` results in 00000100, and ~00000100 results in 11111011.
+
+• **AND Operation:** Performing num & mask clears the i-th bit. If num = 29 (binary 11101), then 29 & 11111011 results in 11001 (binary 11001, decimal 25).
+
+# Key Points:
+
+## Bitwise Operators:
+
+➔ `~`: Bitwise NOT (flips all bits)
+
+➔ `&`: Bitwise AND
+
+➔ `<<`: Left shift (shifts bits to the left)
+
+This technique is widely used in low-level programming, graphics, networking, and other areas where efficient bit manipulation is crucial.