Re: mov al,0f0h

rajdips@xxxxxxxxx wrote:
since al registyer is 8-bit why we need to give 2-digit.but in MOV
AL,OFOH in this why we giving 3-digit that is 0F0h.

An identifier may not start with a decimal digit. A number *must* start with a decimal digit. (true for all assemblers I'm aware of)

BAH db 42

mov eax, BAH
mov bl, 0BAH

It's just so the assembler can figure out what in hell you're talking about. It *looks* like too many digits to fit in a byte, but of course the leftmost zero doesn't add anything to the value of the number. Most(?) assemblers will also accept the "C-style" 0xBA - but a leading 0 *doesn't* (usually) indicate octal...

Best,
Frank

.

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