I need to do some large integer math. Are there any classes or structs out there that represent a 128-bit integer and implement all of the usual operators?
BTW, I realize that decimal can be used to represent a 96-bit int.
What type should I use for a 128-bit number in in .NET?
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9 Answers
It's here in System.Numerics. "The BigInteger type is an immutable type that represents an arbitrarily large integer whose value in theory has no upper or lower bounds."
var i = System.Numerics.BigInteger.Parse("10000000000000000000000000000000");
No, there's nothing in .NET <= 3.5. I'm hoping/expecting that BigInteger will make its return in .NET 4.0. (It was cut from .NET 3.5.)
System.Int128 and System.UInt128 have been available since .NET Core 7.0 Preview 5
They were implemented in Add support for Int128 and UInt128 data types
I don't know why they aren't in the .NET 7 Preview 5 announcement but in the upcoming .NET 7 Preview 6 announcement there'll also be Int128Converter and UInt128Converter for the new types in Preview 5
They didn't have C# support yet though, just like System.Half
If you don't mind making reference to the J# library (vjslib.dll included with VS by default) there is already and implementation of BigInteger in .NET
using java.math;
public static void Main(){
BigInteger biggy = new BigInteger(....)
}
I believe Mono has a BigInteger implementation that you should be able to track down the source for.
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