How does bitwise not operator(~)work ?

Question

int a=10;
System.out.println(~a);
//ans is -11
//can anyone explain this??

Answer 1

The bitwise not operator (~) changes any 0 in the binary value of 10 to a 1, and any 1 in the binary value of 10 to a 0. So basically, it switches the 0s and 1s. To find the answer, first convert 10 to binary. Then switch every 1 out with a 0 and every 0 out with a 1. Convert this back into binary and you get -11.
I hope this helps! Respond back if you are still confused.