binary

Discussion in 'A+' started by joker001, Aug 9, 2006.

  1. joker001

    joker001 Bit Poster

    27
    0
    7
    Ive just watched a video about the A+. when it came to the binary maths bit. it said it uses 1 2 4 8 16 32 64 but correct me if Im wrong but I thought it went up to 128 as in 8 bits not 7

    Am I right or wrong ?
     
    WIP: A+
  2. zimbo
    Honorary Member

    zimbo Petabyte Poster

    5,215
    99
    181
    yes you are right... 8 bits is correct...
     
    Certifications: B.Sc, MCDST & MCSA
    WIP: M.Sc - Computer Forensics
  3. The_Geek

    The_Geek Megabyte Poster

    772
    13
    64
    You are correct:

    128 64 32 16 8 4 2 1
     
    Certifications: CompTIA and Micro$oft
    WIP: PDI+
  4. r.h.lee

    r.h.lee Gigabyte Poster

    1,011
    52
    105
    joker001,

    You're correct if we're using an 8 bit word without high bit negation.

    8 bit word without high bit negation:
    • Can have a binary value from 00000000 to 111111111.
    • This corresponds to a decimal range of 0 to 255.
    • Binary 00001010 is decimal 10.
    • Binary 10001010 is decimal 138.
    8 bit word with high bit negation:
    • Can have a binary value from 11111111 to 01111111.
    • This corresponds to a decimal range of -127 to 127.
    • Binary 00001010 is decimal 10.
    • Binary 10001010 is decimal -10.

    I think the reason the A+ video stopped at 64 is because if they did go to 128, then the video would be longer and thus more expensive to produce. So 1->64 may be "enough" according to their lesson plan to teach binary.
     
    Certifications: MCSE, MCP+I, MCP, CCNA, A+
    WIP: CCDA
  5. hbroomhall

    hbroomhall Petabyte Poster Gold Member

    6,624
    117
    224
    In fact the series goes on forever. I suspect that 64 was just a convenient place to stop!

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  6. steveh2001

    steveh2001 Byte Poster

    204
    3
    22
    And then they would need to provide us a calculator in the exam:D :blink
     
    Certifications: A+,N+,CommVault,MCSA/MCSE 2003,VCP 4.1.
    WIP: ?
  7. hbroomhall

    hbroomhall Petabyte Poster Gold Member

    6,624
    117
    224
    Not really - the trick is to write down the progression on the paper you are supplied with when you start the exam. As each value is double the last this *should* be trivial.

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+

Share This Page

Loading...
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.