c# - Working with arbitrary numbers -

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I want to write a class that is simple command like DD (1000000000000, 10000000000) 20000000000

I have found a list of limitations for data types in C #: 

  Data type Maximum positive value Int32 2,147,483,647 UInt32 4,294,967,295 But if my number, for example,  20,000,000,000,000,000,000,000,000,000,000,000   
 how do you    Using System.Numerics.BigInteger  Can?   
 
 
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