How do unsigned integers work

Question

As the title suggests, I am curious about how an unsigned int (or things like NSUInteger, u_int_blah, but I assume these are all

Answer 1

When you assign a negative number

unsigned int = -1;

The number you got will be 4294967295, or 4^8 -1

because the size of integer is 4bytes, or 4^8 = 4294967296

The integer will wrap around this number if it is negative