In python (ver 3.5)

*Convert binary numbers to decimal.

The algorithm to convert binary numbers to decimal is to start at the high end, scanning through

the string from left to right. Each time a 1 character is encountered, the value of 2 raised to the

appropriate power is added in. Recall that the last position is 20, or the value of 1. (In an eight-bit

binary string, the rst position is 27, or 128.)

*Should also be able to deal with negative numbers!!