Modified dhhalfadderbase10 for more simplicity.
half adder fully function

removed exceptions.
the answers still look correct
fulladder updated but not tested
full adder tested
finished big integer but not testing yet
tested bigInteger.  it can initialize to a number
summing two big integers seems to work
Single digits can multiply each other
BigInteger class can now handle multiplication
PE-17 Factorial Digit Sum

sum up the digits of 100!
Merge pull request #18 from wh1pch81n/dh-2013-9-9

PE-17 Factorial Digit Sum