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Posted 12 Nov 2012

Transform between IEEE, IBM or VAX floating point number formats and bytes expressions

, 16 Dec 2012 CPOL
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This is an alternative for "Transform between IEEE, IBM or VAX floating point number formats and bytes expressions"


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John Hou's work, Transform between IEEE, IBM, and VAX floating point numbers, was originally written in C++. I took John's work, and converted it to C# 4.0. This code helps with converting IBM floats to IEEE floats and vice-versa. It also includes transformations for VAX floats to IEEE floats.

This is a C# version of John Hou's wonderful work. Tangible software did the initial C++ to C# conversion, which I then cleaned up, fixed missing areas, and then wrapped the engine to make it easier to work with for .NET developers.


John Hou's work is documented here.

Using the code

The solution included here has a test project illustrating a simple IBM float conversion. Not every aspect of the code conversion was tested since the immediaten eed was IBM float support. Others are welcome to work on the VAX or IEEE parts. All code is in C#.

The main class library is Converter. It can be called as:


Converter c =new Converter();
byte[] bytes = new byte[] { 0x00, 0x00, 0x00, 0x80, 0x31, 0x93, 0x60, 0x48 };
double d = c.ConvertBytesToDouble(Platform.IbmFloat, bytes);

Console.WriteLine("Correct return value should be: " + 1620259200);
Console.WriteLine("Return Value:                   " + d);
Console.WriteLine("Press any key to continue...");

Additional methods available off of the Converter class are:

  • ConvertDoublesToBytes - Converts a double value to byte array
  • ConvertSingleToBytes - Converts single floats to byte array

All of the methods will take a Platform enum indicating the source of the origination bytes or doubles. 


2012-11-12  Initial version.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Alan Churchill
Software Developer (Senior) Savian
United States United States
SAS, Microsoft developer/consultant.

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Comments and Discussions

QuestionDownload link Pin
Ngaima Sandiman12-Nov-12 20:45
memberNgaima Sandiman12-Nov-12 20:45 

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