Please help me!

This is a discussion on Please help me! within the Tech Board forums, part of the Community Boards category; Hi, i hv a problem in intel 80x86 assembly language programming my Question is: Add these two number 22 +88 ...

  1. #1
    Registered User
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    Please help me!

    Hi,
    i hv a problem in intel 80x86 assembly language programming
    my Question is:
    Add these two number

    22
    +88
    ----
    100
    this program is in REAL MODE (16 bit programming)

    i known This Board Is Not For Assembly Language , BUT Please Help Me .
    Admin PLease tell Me Where I Wrote My Question please please .
    ThankYou.

  2. #2
    Cat without Hat CornedBee's Avatar
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    Actually, the tech board is fine for assembly questions. Just don't expect too much expertise.

    So ... what have you tried, and why doesn't it work? We don't do your homework.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
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  3. #3
    C++ Witch laserlight's Avatar
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    Whoops, I moved this thread from the C++ programming board to here and forgot to leave a note.
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    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  4. #4
    Frequently Quite Prolix dwks's Avatar
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    I don't know assembly, but (from http://en.wikipedia.org/wiki/X86_assembly_language):
    Integer ALU instructions
    x86 assembly has the standard mathematical operations, add, sub, mul, with idiv; the logical operators and, or, xor, neg; bitshift arithmetic and logical, sal/sar, shl/shr; rotate with and without carry, rcl/rcr, rol/ror, a complement of BCD arithmetic instructions, aaa, aad, daa and others.
    Wouldn't one use the add instruction? . . .
    dwk

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  5. #5
    Kernel hacker
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    Code:
       mov ax, 22
       add ax, 88
    Except that will make 110, but never mind. [Probably breaking the rules about Homework here]

    --
    Mats

  6. #6
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    Question This For All Repies :(

    First Of All , My Question Is Not HOMEWORK.
    my friend ask me this Question , and i don't hv ans it.
    please if any body known the answer of this then, i wiil be very thank for him/her.
    ThankYou Again.

  7. #7
    Kernel hacker
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    I think my answer is correct - it's very low on context, but so is your question.

    The fact that 22 + 88 gives the answer 110 is not a fault of the code I wrote, but rather that 22 + 88 makes 110 whatever method you add them - try it with a calculator, or by hand, or soemthing.

    THere are of course multiple other ways to add two numbers together in assembler, because there are several instructions that result in the same thing:

    A less obvious variety:
    Code:
       mov ax, 22
       mov bx, 88
       neg  bx
       sub  ax, bx
    This is equivalent to 22 - (-88), which of course is the same as 22 + 88.

    Result is still 110 of course.
    --
    Mats

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