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实现了大整数的四则运算的基础类,BIgInt类的设计与实现

                            C++ Big Integer Library
                          (see ChangeLog for version)

                      http://www.kepreon.com/~matt/bigint/

        Written and maintained by Matt McCutchen <[e-mail]>

You can use this library in a C++ program to do arithmetic on integers of size
limited only by your computer's memory.  The library provides BigUnsigned and
BigInteger classes that represent nonnegative integers and signed integers,
respectively.  Most of the C++ arithmetic operators are overloaded for these
classes, so big-integer calculations are as easy as:

    #include "BigIntegerLibrary.hh"
    
    BigInteger a = 65536;
    cout << (a * a * a * a * a * a * a * a);
    
    (prints 340282366920938463463374607431768211456)

The code in `sample.cc' demonstrates the most important features of the library.
To get started quickly, read the code and explanations in that file and run it.
If you want more detail or a feature not shown in `sample.cc', consult the
consult the actual header and source files, which are heavily commented.

Compiling programs that use the library
---------------------------------------
The library consists of a folder full of C++ header files (`.hh') and source
files (`.cc').  `#include' header files and compile with source files as
necessary for your own programs.  A Makefile is included that compiles the
library source files and the sample program and links them together; you can
easily customize the Makefile to replace the sample with your own program, or
you can write your own Makefile.

Bugs and enhancements
---------------------
The library has been tested by me and others but is by no means bug-free.  If
you find a bug, please report it to me, whether it comes in the form of
compiling trouble, a mathematically inaccurate result, or a memory-management
blooper (since I use Java, these are altogether too common in my C++).  I
generally fix all reported bugs.

You are also welcome to request enhancements, but I am unlikely to do
substantial amounts of work on enhancements at this point.  When I fix a bug you
report or make an enhancement you request, I will generally credit you by name
in the source code and/or the Change Log unless you request otherwise.  New
versions of the library will be available at its Web site (above).

Note
----
I would be delighted to hear from you if you like this library and/or find a
good use for it.

Legal
-----
I, Matt McCutchen, the sole author of the original Big Integer Library, waive my
copyright to it, placing it in the public domain.  The library comes with
absolutely no warranty.

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