4j: Convert a decimal number to binary and vice versa.
|binary||a base 2 number system (using digits 0 and 1) where each digit is worth 2 times as much as the digit to its right|
|decimal||a base 10 number system (using digits 0-9) where each digit is worth 10 times as much as the digit to its right|
|denary||another name for decimal|
|unsigned||a number that can only greater than or equal to zero|