What is a half adder subtractor?

Question

Hi all,

My question is firstly what is a half adder subtractor.

Secondly and most importantly i have to simulate one using Microsoft Powerpoint.

Does anyone know how i could do this?

Does anyone know any web links that show a simulation of a half adder subtractor.

Thanks to all that can help!

Answer 1

Half adder is how computers perform basic math operations using bits instead of numbers.  The process is well-documented and widely understood by computer scientists.  

Check the Google search link.

Answer 2

If I remember correctly, a half adder takes two bits(binary 0 or 1 input) and adds them together, the result appearing on the output like as a one or a zero.  A full adder has an additional output line for the carry.  So:

Half adder

0 + 0 = 0

1 + 0 = 1

0 + 1 = 1

1 + 1 = 0

Full adder

0 + 0 = 0 carry 0

1 + 0 = 1 carry 0

0 + 1 = 1 carry 0

1 + 1 = 0 carry 1