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Hexadecimal

Discussion in 'A+' started by st giles, Sep 23, 2005.

  1. st giles

    st giles Nibble Poster

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    Hi there,
    Anybody got any good ideas as to how to easily work out hexadecimal values. Mike Meyers tries his best to explain but still can't grasp it :blink
     
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  2. Clyde

    Clyde Megabyte Poster

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    can you do binary?

    cos hex to binary is dead easy, then do binary to decimal...

    for the record. each hex value = 4 binary numbers so any 2 hex codes = 8 bits.
     
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  3. Boycie
    Honorary Member

    Boycie Senior Beer Tester

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    Hi,

    In what way are you stuck?
    As clyde has already said, hex bits are equal to 4 and binary are equal to 2.

    8 on's or eight ones (binary set to 1) would make FF

    1 1 1 1 1 1 1 1
    128 64 32 16 8 4 2 0

    Hex is used because binary only goes up to 10.
    You can use the scentific calculator in XP to help you to convert and you will then "see for yourself".
    For a proper explanation go here!
     
    Certifications: MCSA 2003, MCDST, A+, N+, CTT+, MCT
  4. st giles

    st giles Nibble Poster

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    Hi,
    Well, he says the binary value is 0000000111110000.
    Then to break it up into sets of four. 0000 0001 1111 0000.
    I understand that. Then he calculates it as
    0000=0 0001=1 1111=F 0000=0.
    So how does he come to the conclusion that 1111=F when you consider 0-9 is the first ten numbers and the next six are A-F in the 16 digit numbering system. Please explain as i may just be having a funny moment :oops:
     
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  5. st giles

    st giles Nibble Poster

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    Cheers Chaps.
    Will do battle with my brain to work it out :box2
     
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  6. Clyde

    Clyde Megabyte Poster

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    bin hex
    0000 0
    0001 1
    0010 2
    0011 3
    0100 4
    0101 5
    0110 6
    0111 7
    1000 8
    1001 9
    1010 a
    1011 b
    1100 c
    1101 d
    1110 e
    1111 f

    hope that helps !

    IF you can count in binary, ANY 4 binary digits = one hex digit.

    its a numbering system with 16 symbols. Decimal has ten symbols and binary 2...
     
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  7. Boycie
    Honorary Member

    Boycie Senior Beer Tester

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    Hi,

    1111 equals 8 4 2 1. Do you see that?
    Good, then if you add them up then you get 15?
    15 in Hex is F.
    As far as I can remember, check the content, the A+ core only tests your knowledge on Binary to decimal and the other way around.
    It is good to know hex, though. See my above post for a good link!
    Let us know if you need further help.
     
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  8. tripwire45
    Honorary Member

    tripwire45 Zettabyte Poster

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    It's been awhile since I took the A+ so I don't recall...are you required to do decimal to hex conversions and vice versa? :blink
     
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  9. Clyde

    Clyde Megabyte Poster

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    no, but it sure helps in understanding a lot of things!
     
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