& is a bitwise AND operator in C language, used to compare two operands bit by bit. If the corresponding bits are both 1, the result bit is 1, otherwise it is 0. Specific application scenarios include: testing whether a specific bit is 1, setting a specific bit to 0, and masking a specific bit.
##What is & in C language
& In C language it is a bitwise AND operator. It performs a bitwise comparison of each bit of the two operands, and if both bits are 1, the result is 1, otherwise it is 0.
How the bitwise AND operator works
For example, suppose we have two 8-bit integersa and
b:
<code>a = 0b10101101 b = 0b01101011</code>When we perform a bitwise AND operation on
a and
b, we compare each bit:
<code>1 & 0 = 0 0 & 1 = 0 1 & 1 = 1 0 & 0 = 0 1 & 1 = 1 1 & 0 = 0 0 & 1 = 0 1 & 1 = 1</code>Thus,
a & The result of b is:
<code>0b00101001</code>
Scenarios using bitwise AND operator
The bitwise AND operator has many applications in C language, including:- Test whether a specific bit is 1: If
- a & (1 is 1, it means the nth of
a
bit is 1.
Set the specific bit to 0: If - a & ~(1 is used, it means that the n
of
abit cleared.
Mask specific bits: If - a & MASK
is used, where
MASKis a mask, it means
awill be neutralized with
Bits that differ from MASKare cleared.
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