Answer to Question #27865 in C++ for asha

Question

a=a-~b-1; how this works please explain

Answer 1

"~" in C++ is bitwise operation NOT. Thebitwise NOT, or complement, is an unary operation that performs logical
negation on each bit, forming the ones' complement of the given binary value.
Bits that are
0 become 1, and those that are 1 become 0. The bitwisecomplement is equal to the two's complement of the value minus one. If two's
complement arithmetic is used, then ~x = - x - 1.
In your case
a = a - ~b - 1 = a - (-b + 1) - 1 = a + b;