Bitwise AND Operator (&)

In Fig. 20.8, line 13 assigns 2179876355 (10000001 11101110 01000110 00000011) to variable number1, and line 14 assigns 1 (00000000 00000000 00000000 00000001) to variable mask. When mask and number1 are combined using the bitwise AND operator (&) in the expression number1 & mask (line 19), the result is 00000000 00000000 00000000 00000001. All the bits except the low-order bit in variable number1 are “masked off” (hidden) by “ANDing” with constant MASK.