What does ~0 do?

Question

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Does ~0 mean its flipping 000000000 to 1111111111?

printf(\"Check: %i\", ~0);

The printf results to -1, which is why I am confused. <

Answer 1

Does ~0 mean its flipping 000000000 to 1111111111?

Yes, it does.

Does -1 essentially mean the same thing as 11111111111111111 bits?

In 2s complement representation, it does.