What does &= mean in c++

The &= operator in C is a bitwise AND assignment operator, which performs a bitwise AND operation on the bit values ​​of the two operands, and stores the result in the left operand. It is often used to clear, set, extract specific bits in a variable, or perform bit mask operations.

Meaning of &= operator in C

&= is the bitwise AND assignment operator in C. It performs a bitwise AND operation on the bit values ​​of the two operands and stores the result in the left operand.

How it works

Assume x and y are two integers:

• For each bit in binary, if x and y The corresponding bits are all 1, then the result is 1.
• Otherwise, the result is 0.

Syntax

x &= y;

Where:

• x is the left operand, storing the result.
• y is the right operand and participates in the bitwise AND operation.

Example

int x = 10; // 二进制：1010
int y = 6;  // 二进制：0110
x &= y;     // 结果为 2，二进制：0010

Usage

&= operator is usually used for:

• Clear some bits in the variable.
• Set certain bits in the variable.
• Extract certain bits from the variable.
• Perform bit masking.

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