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3. How do you account for the difference obtained in previous question? 4. Why should AX be used not AL?

In assembly language.

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Answer #1

4)

AX is of 16 bit register and AH and AL are of 8- bits.

Reason is than AH and AL when you use at once for operation leads to some time overflow of bits this may lead to loss of data .Therefore to avoid such type of errors we use large bit AX or EAX .

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