They, thus, wrap around the address space to zero. This way, 8-bit variables remain unchanged for decrements and cannot wrap around.
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Additionally, the microprocessor has an adder that adds 8 to the variable and the carry out of this addition is a bit, which is set to 1. The 16 result added to 1 gives 16.
Similarly, subtraction is done by adding 16 to the variable, so that 16 minus (16 – 8) is 16.
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