Since int on your system is most likely a 32-bit number, all bits are flipped, including the ones that were insignificant zeros in the original number.
15 is of type int. Depending on how big int is, the representation of 15 ends in 1111, but it starts with a bunch of 0s.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.