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ECE - logic circuit for a 4 bit input which counts 1s in input

  1. Mar 2, 2008 #1
    1. The problem statement, all variables and given/known data

    Using basic gates and/or building blocks, design a logic circuit that takes in a 4 bit input and will compute the number of 1s in the input.

    2. Relevant equations

    3. The attempt at a solution

    I have no idea where to start can anyone help please.
  2. jcsd
  3. Mar 2, 2008 #2
    Maybe a good place to start is to enumerate your basic building blocks telling us what each one does.... That will get you started.
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