4-Bit and Full Adders?!?!

Discussion in 'Homework Help' started by dabtahi123, Oct 11, 2010.

  1. dabtahi123

    Thread Starter New Member

    Oct 11, 2010
    1
    0
    HI!
    So I'm having an issue with these questions:

    Why is a full-adder needed?
    Why is a 4-bit adder needed and why does it have such a peculiar shape?

    Thank you! This is for my Computer Application course..
     
  2. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    The full adder makes the operation of addition taking into account an Input-Carry, possibly produced by a previous addition, which makes it ideal for chaining long number additions.

    A 4-bit adder makes our life even easier, since 4-bit number addition is very often in digital circuits, and we can use it right-away instead of building it from 4 1-bit adders. As for its shape, well... beaty is in the eye of the beholder.
     
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