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81 lines
3.6 KiB
Text
81 lines
3.6 KiB
Text
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Note by Clifford Wolf:
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This version of bigint was downloaded at 2012-08-29 from
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https://mattmccutchen.net/bigint/bigint-2010.04.30.tar.bz2
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Some minor changes were made to the source code (e.g. "using"
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was added to access declarations to prohibit compiler warnings).
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==============================================================================
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C++ Big Integer Library
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(see ChangeLog for version)
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http://mattmccutchen.net/bigint/
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Written and maintained by Matt McCutchen <matt@mattmccutchen.net>
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You can use this library in a C++ program to do arithmetic on integers of size
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limited only by your computer's memory. The library provides BigUnsigned and
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BigInteger classes that represent nonnegative integers and signed integers,
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respectively. Most of the C++ arithmetic operators are overloaded for these
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classes, so big-integer calculations are as easy as:
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#include "BigIntegerLibrary.hh"
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BigInteger a = 65536;
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cout << (a * a * a * a * a * a * a * a);
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(prints 340282366920938463463374607431768211456)
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The code in `sample.cc' demonstrates the most important features of the library.
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To get started quickly, read the code and explanations in that file and run it.
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If you want more detail or a feature not shown in `sample.cc', consult the
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consult the actual header and source files, which are thoroughly commented.
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This library emphasizes ease of use and clarity of implementation over speed;
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some users will prefer GMP (http://swox.com/gmp/), which is faster. The code is
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intended to be reasonably portable across computers and modern C++ compilers; in
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particular, it uses whatever word size the computer provides (32-bit, 64-bit, or
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otherwise).
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Compiling programs that use the library
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---------------------------------------
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The library consists of a folder full of C++ header files (`.hh') and source
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files (`.cc'). Your own programs should `#include' the necessary header files
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and link with the source files. A makefile that builds the sample program
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(`sample.cc') is included; you can adapt it to replace the sample with your own
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program.
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Alternatively, you can use your own build system or IDE. In that case, you must
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put the library header files where the compiler will find them and arrange to
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have your program linked with the library source files; otherwise, you will get
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errors about missing header files or "undefined references". To learn how to do
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this, consult the documentation for the build system or IDE; don't bother asking
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me. Adding all the library files to your project will work in many IDEs but may
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not be the most desirable approach.
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Resources
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---------
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The library's Web site (above) provides links to released versions, the current
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development version, and a mailing list for release announcements, questions,
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bug reports, and other discussion of the library. I would be delighted to hear
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from you if you like this library and/or find a good use for it.
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Bugs and enhancements
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---------------------
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The library has been tested by me and others but is by no means bug-free. If
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you find a bug, please report it, whether it comes in the form of compiling
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trouble, a mathematically inaccurate result, or a memory-management blooper
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(since I use Java, these are altogether too common in my C++). I generally fix
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all reported bugs. You are also welcome to request enhancements, but I am
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unlikely to do substantial amounts of work on enhancements at this point.
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Legal
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-----
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I, Matt McCutchen, the sole author of the original Big Integer Library, waive my
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copyright to it, placing it in the public domain. The library comes with
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absolutely no warranty.
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~~~~
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