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Floating Point Numbers.

  • 19-05-2005 8:21pm
    #1
    Sully
    Moderators, Education Moderators, Technology & Internet Moderators, Regional South East Moderators Posts: 24,056 Mod ✭✭✭✭


    Hi,

    Iv a computer exam tmrow and im just doing some study. One of the questions will be on Floating Point, multiplying/dividing/adding/subtraction and representing numbers in floating point form in a digital computer. Iv done a few sums, and id like to see if someone can verify im doing it ok :) Cant find a calculator on the net for it so I thought someone here may be able to help?

    A.B
    ---
    0.4321 x10-6 (-6 is to the power of)
    -6.325 x 10-4 (-4 is to the power of)
    ______________________________
    -2.7330325 x 10-10 (-10 is to the power of)

    Final Result:

    -.27330325x10-9 (-9 to the power of)


Comments

  • #2
    NotMe
    Registered Users, Registered Users 2 Posts: 4,287 ✭✭✭NotMe


    google is a calculator


  • #3
    g5hn710m4xpdwy
    Closed Accounts Posts: 1,763 ✭✭✭g5hn710m4xpdwy


    wow, you helped him so much... :rolleyes: but yeah i guess your right and there is no point arguing


  • #4
    Sully
    Moderators, Education Moderators, Technology & Internet Moderators, Regional South East Moderators Posts: 24,056 Mod ✭✭✭✭Sully


    NotMe wrote:
    google is a calculator

    For Floating Point Number Calculations?


  • #5
    Giblet
    Registered Users, Registered Users 2 Posts: 11,998 ✭✭✭✭Giblet


    That is correct.


  • #6
    Nietzschean
    Registered Users, Registered Users 2 Posts: 7,314 ✭✭✭Nietzschean


    Sully04 wrote:
    A.B
    ---
    0.4321 x10-6 (-6 is to the power of)
    -6.325 x 10-4 (-4 is to the power of)
    ______________________________
    -2.7330325 x 10-10 (-10 is to the power of)

    Final Result:

    -.27330325x10-9 (-9 to the power of)
    Erm just use any scientific calculator?

    and btw your answer is correct, and more informative notation would be something like 10^-6 for 10 to the power of -6....


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  • #7
    Giblet
    Registered Users, Registered Users 2 Posts: 11,998 ✭✭✭✭Giblet


    He might not be able to use one hehe.

    Add the powers, multiply the numbers.


  • #8
    Sully
    Moderators, Education Moderators, Technology & Internet Moderators, Regional South East Moderators Posts: 24,056 Mod ✭✭✭✭Sully


    Lovely. Found it. Thanks


  • #9
    Khannie
    Registered Users, Registered Users 2 Posts: 37,485 ✭✭✭✭Khannie


    Love that google calculator. It also does unit conversion.

    e.g. 10 kilometres to miles <enter>

    Brilliant.


  • #10
    CyberGhost
    Registered Users, Registered Users 2 Posts: 5,564 ✭✭✭CyberGhost


    Sully04 wrote:
    A.B
    ---
    0.4321 x10-6 (-6 is to the power of)
    -6.325 x 10-4 (-4 is to the power of)
    ______________________________
    -2.7330325 x 10-10 (-10 is to the power of)

    Final Result:

    -.27330325x10-9 (-9 to the power of)

    wtf is that? a flux capacitor?


  • #11
    Inspector Gadget
    Registered Users, Registered Users 2 Posts: 1,393 ✭✭✭Inspector Gadget


    Sorry, I'm a bit confused. Floating-point arithmetic? Either this is waaaay to simplistic, or the inhabitants of this thread have very much gotten the wrong end of the stick.

    If you're talking about how floating-point numbers are operated on in a digital computer (as in how the numbers are stored and the various methods of doing adds/divides etc) do a google for IEEE-754 - it's the standard for how floating point numbers are represented in binary in most computer systems.

    I wouldn't know offhand what to recommend in terms of reading material, but there's plenty out there...

    [edit]Aww crap, looks like I found this thread too late... sorry.[/edit]

    Gadget.


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