一个C++类中的十进制数，计算精度允许任意长度的/。

I started this project from an interest in approximating pi. I decided the most straight forward way of doing this was to use mathematical formulas which would require a high degree of accuracy for a number class. The class supports most of the basic operations (+,-,*,/) though the code is rather messy since I started this while I was learning C++. It"s a work in progress and can definitely be optimized. The biggest accomplishment I"ve gotten from it so far was approximating pi to 10,000 places which took two weeks. I realize that it is a horribly inefficient way of creating a arbitraty precision class, but hey, it works (as far as I"ve tested it anyway). I also started a rational number class (Fraction) based on the big decimal class (DEC).