Full Adder into subtractor

Discussion in 'Homework Help' started by Thirsty, Oct 9, 2006.

  1. Thirsty

    Thread Starter New Member

    Aug 9, 2006
    5
    0
    does anyone know how I can do this using a switch and 4bit full adder
     
  2. Papabravo

    Expert

    Feb 24, 2006
    9,898
    1,722
    Run one of the two operands to a circuit that takes the two's complement. Use the switch and a multiplexer to select either the true operand for addition or the twos complement operand for subtraction.

    Can you work out the details from here?
     
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