I have a Hexadecimal value in AL register in 8086 programming. How can I change it into decimal number?

Question

The values in registers are just numbers. They aren't hexadecimal numbers or decimal numbers. If you want to be really pedantic, they are all stored internally as binary numbers. — Raymond Chen, Jul 08 '22 at 15:58
Hex and decimal are number *formats* -- they are ways to represent/communicate/show numbers as a sequence of characters, i.e. in string form. — Erik Eidt, Jul 08 '22 at 15:59

score 4 · Answer 1 · answered Jul 08 '22 at 16:03

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You don't have a hexadecimal number, you have a binary number. That's the only kind in digital processors. If you need to display it in decimal - you need to convert it to ASCII string manually, here's an example: https://stackoverflow.com/a/23959237/4632951

answered Jul 08 '22 at 16:03

Andrew Morozko

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SO's canonical answers for this are [Displaying numbers with DOS](https://stackoverflow.com/q/45904075) for x86-16 DOS, and a few including [How do I print an integer in Assembly Level Programming without printf from the c library?](https://stackoverflow.com/a/46301894) . For converting a number in a register into ASCII hex, see [How to convert a binary integer number to a hex string?](https://stackoverflow.com/q/53823756) – Peter Cordes Jul 09 '22 at 01:26

score 1 · Answer 2 · answered Jul 08 '22 at 16:04

How can I change it into decimal number?

Use math!

If you have a number and want to know the value of the last digit, in decimal, you would do modulus 10. So, if the number is 1234 then %10 on that would give you 4, and if the number is 5678, then %10 on that would yield 8.

Similarly, if you wanted to work on the 123 part you would divide 1234 by 10 to get 123. Now you can %10 on that result to get 3.

There are algorithmic write ups of these, generally called itoa or integer to ascii/string.

I have a Hexadecimal value in AL register in 8086 programming. How can I change it into decimal number?

2 Answers2