What does x&=1 mean in C language?

In C language, x &= 1 performs a bitwise AND operation on the binary bits of x and 1, and stores the result back to x. If the lowest bit of x is 1, the result is 1; if the lowest bit of x is 0, the result is 0.

The meaning of x&=1 in C language

In C language, x&=1 is a bit operation An expression that performs a bitwise AND operation on the binary bits of variable x and 1, and stores the result back in x.

Specifically: the binary bitwise AND of

• x and 1, the result is 0 or 1.
• If the lowest bit of x is 1, the result of bitwise AND with 1 is still 1.
• If the lowest bit of x is 0, the result of bitwise AND with 1 is 0.

Example:

Assume that the binary representation of x is 1011 (decimal 11):

# The calculation process of

• ##x&=1 is:

  Binary:
  • 1011 & 0001
  Result:
  • 0001
Therefore, the value of
• x becomes binary 0001 (decimal 1) .

Uses:

x&=1 Commonly used for:

Check the final value of a binary number Whether the right digit is
• 1.
Clear the rightmost digit of the binary number.
• Alternate the value of the Boolean variable.

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