CInt96 v1.04 - 96 Bit Integers

Download source files - 10 Kb

Introduction

If you have every been doing any arithmetic which stretches the limits of the build in __int64 data type in Visual C++, then here is a class which gives you an extra 4 bytes to play with.

Features

Usage

History

Enhancements

Contacting the Author

Features

• Provides constructors which convert between all the basic types (including __int64) to CInt96.
• All the standard operators are provided allowing the class to be used as if it was an intrinsic data type.
• Methods are provided to convert to and from Hex, binary and decimal strings.
• Functions are available to allow individual bits to be easily set or retrieved.

The source zip file contains the CInt96 source code and a simple console program which exercises the class.

Usage

• To use the class in your code simply include int96.cpp in your project and #include int96.h in which ever of your modules needs to make calls to the classes.
• Your code will need to include MFC either statically or dynamically.
• To see the class in action, have a look at the code in main() in the module test.cpp.

History

v1.0 (11 July 1999)

• Initial public release.

V1.01 (17 October 1999)

• Fix for the function FormatAsDecimal() which was failing when the number starts with a "10".

V1.02 (26 October 1999)

• Fixed bug in operator!=.
• Fixed bug in operator^.
• Fixed bug in operator|.
• Fixed bug in operator&.
• All relational and equality operators now return int instead of BOOL.
• Provision of operators which convert back to basic C types.
• Improved the performance of operator*.
• Fixed problem with 0/0 which was returning 0 instead of the correct value of undefined, i.e. divide by 0 exception. Thanks to G.J.E. Visser for finding all these bugs <g>.

V1.03 (28 October 1999)

• Fixed another bug in operator!=.
• Removed the use of MAXDWORD and replaced with 0xFFFFFFFF.

V1.04 (5 December 1999)

• Fixed problem with operator* which was giving incorrect results in some cases. Thanks go to G.J.E. Visser for finding this.

Planned Enhancements

• Optimize the code through the use of inlining and improved algorithms.
• Generalize the class to make it arbitrary precision.
• Improve the sample app as at the moment it just tests out most of the methods provided by CInt96.
• If you have any other suggested additions, comments or bug fixes, please let me know so that I can try my best to incorporate them into the next version of CInt96.

Contacting the Author

PJ Naughter
Email: pjn@indigo..ie
Web: http://www.naughter.com
5 December 1999