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  1. #1
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    Comparison

    Hi Gurus,

    Its somewhat frustrating question.

    Is there any way to compare two numbers without using any conditional operator like (<,>) ?

    thanx,
    -piyu

  2. #2
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    why cant you use the '<','>', etc. operators ?
    your humble savant

  3. #3
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    VictorN is offline Super Moderator Power Poster
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    What do you mean under "to compare two numbers" ?

  4. #4
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    See,

    Suppose a = 10 and b = 20. are two numbers.

    i want to know which is greater out of them. For this purpose we can use '<','>' operators. but i don't want to use them to achieve the result as 20.

    Is there any way out ?

  5. #5
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    You dont want to use:

    PHP Code:
    int a 10 ;
    int b 20 ;

    if(
    a>b)
    {
      
    // do something
    }
    if(
    b>a)
    {
      
    // do something
    }
    if(
    20==b)
    {
      
    // do something

    ?
    your humble savant

  6. #6
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    Yah, inequality operators are terrible for determining order.
    I mean what does one have to do with the other.
    Wakeup in the morning and kick the day in the teeth!! Or something like that.

    "i don't want to write leak free code or most efficient code, like others traditional (so called expert) coders do."

  7. #7
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    yes, TheRogue

    I really don't want to use these operators.

    I am also thinking that we can' t do this.. but still i wan't to raise on CODEGURU coz there are really good ppls who can answer it well.

    -Piyu

  8. #8
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    Well, I am just curious. Please tell us why you don't want to use
    them.
    Wakeup in the morning and kick the day in the teeth!! Or something like that.

    "i don't want to write leak free code or most efficient code, like others traditional (so called expert) coders do."

  9. #9
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    Pretty please..with sugar on top.
    Wakeup in the morning and kick the day in the teeth!! Or something like that.

    "i don't want to write leak free code or most efficient code, like others traditional (so called expert) coders do."

  10. #10
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    Hi souldog,

    Thanx for being curios with the question.

    See.
    I want to write an assembly language code for one specific microprocessor which doesn't contain any cmp ('compare' ), jl('jump if less'), jg (jump if greater) instructions. so i am thinking how it is possible to find greatest number out of A and B.

    May be my approach is wrong. isn't it ?

    please suggest.

    -Piyu

  11. #11
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    If it has a check for zero,
    could you decrement both variables until one of them is zero ?
    your humble savant

  12. #12
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    Well if you can look at the bits in the numbers starting with
    the MSB and find the first place they are different, then the number
    that has a 1 in this bit is larger.
    Wakeup in the morning and kick the day in the teeth!! Or something like that.

    "i don't want to write leak free code or most efficient code, like others traditional (so called expert) coders do."

  13. #13
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    hi TheRogue


    ---------------
    If it has a check for zero,
    could you decrement both variables until one of them is zero ?
    ----------------

    Fortunatly, i have that instruction with me.
    I can able to decrement both variable until one of them is ZERO.

    now please clarify..

    regards,
    -Piyu

  14. #14
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    start:
    decrement both variables

    if neither variable has reached zero, goto start:

    if one variable has reached zero it is smaller

    if both variables have reached zero they are the same



    ps. what is the microprocessor ?
    your humble savant

  15. #15
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    Do you have a carry flag in a FLAGS register. You can subtract the two numbers and see if a borrow was needed.
    Wakeup in the morning and kick the day in the teeth!! Or something like that.

    "i don't want to write leak free code or most efficient code, like others traditional (so called expert) coders do."

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