Decimal calculations in trading systems

I am doing research about which trading systems are using Decimal calculations?

Seems to me the difference between Double and Decimal is not widely known.
 
My original question was about trading systems not programming languages.

>I am doing research about which trading systems are using Decimal calculations?

Before posting this question I searched first on the forum about similar discussion. But what I found was a technical discussion about C#, C++, VB implementation.
 
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