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# How is Decimal data type stored in 32-bit memory?

Posted on 2011-02-13
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How is the Decimal data type stored in 32-bit memory?

(e.g. i = 100M )
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Question by:deleyd
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Accepted Solution

BurnieP earned 668 total points
ID: 34884711
Hi,

Why are you saying 32 bit?

If you check http://msdn.microsoft.com/en-us/library/364x0z75(v=VS.100).aspx you will see that it is a 128 bit data type.  Even checking other versions of VS by using the link you can see that it was 128 bit in every release of Visual Studio.

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Assisted Solution

ViceroyFizzlebottom earned 668 total points
ID: 34885271
If I'm not mistaken, decimals converted and stored using the IEEE 754 standard. I'm not sure if this will help, but the technical specs can be found here:

http://grouper.ieee.org/groups/754/
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Assisted Solution

mwochnick earned 664 total points
ID: 34885366
Below are links with some explanation of the differences in between float, double and Decimal.
The main thing is that float (32bit) and double (64 bit) can be handled by the hardware Decimal - 128bit has to be handled by software in the case of C# by the CLR.  How Decimal works in C# is explained in the first article.  As to how exactly this is done by the CLR on the 32 bit hardware, i was unable to find anything.

http://gregs-blog.com/2007/12/10/dot-net-decimal-type-vs-float-type/
http://stackoverflow.com/questions/618535/what-is-the-difference-between-decimal-float-and-double-in-c
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Author Closing Comment

ID: 34889868
Excellent. Thank you.
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