This method adds up two integer numbers using bitwise operators.

It implements[full adder](https://en.wikipedia.org/wiki/Adder_(electronics))

electronicscircut logic to sum two 32-bit integers in two's complement format.

electronicscircuit logic to sum two 32-bit integers in two's complement format.

It's using the boolean logic to cover all possible cases of adding two input bits:

with and without a "carry bit" from adding the previous less-significant stage.

-`carryOut`: a bit to carry to the next most-significant stage

-`bitSum`: The sum of`ai`,`bi`, and`carryIn`

-`resultBin`: The full result of adding current stage with all less-significant stages (in binary)

-`resultBin`: The full result of adding current stage with all less-significant stages (in decimal)

-`resultDec`: The full result of adding current stage with all less-significant stages (in decimal)