SD1 examination winter 2020/1

Question

Q:

Consider the following code snippet:

Code	Result
`char c = 0; c -= 1; int cc = c; System.out.println("cc == " + cc);`	cc == 65535

How comes the operator c -= 1 acting on c starting from 0 yields a positive value of 65535?

Answer 1

A:

A char ranges from 0 to $2^{16} - 1$ . The -= operator steps from the lowest possible value to the type's maximum in a cyclic fashion:

    0   00000000 00000000
   -1  -00000000 00000001
-----  ------------------
65535   11111111 11111111

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