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Currently I am borrowing java.math.BigInteger from the J# libraries as described here. Having never used a library for working with large integers before, this seems slow, on the order of 10 times slower, even for ulong length numbers. Does anyone have any better (preferably free) libraries, or is this level of performance normal?
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BigInteger provides analogues to all of Java's primitive integer operators, and all relevant methods from java. lang. Math. Additionally, BigInteger provides operations for modular arithmetic, GCD calculation, primality testing, prime generation, bit manipulation, and a few other miscellaneous operations.
To create a new data type of big integers following concepts are being implemented: C++ strings in that we can store our numbers in the form of characters (in reverse order for efficiency purposes) such that using strings we can store very big numbers also.
The equivalent of Java long in the context of MySQL variables is BigInt. In Java, the long datatype takes 8 bytes while BigInt also takes the same number of bytes.
Step 1: loop from n to 0. Step 1.1: intSum = number1[i] + number2[i] Step 1.2: carry = intSum/10. Sum += intSum Step 2: sum += carry. Step 3: return sum.
As of .NET 4.0 you can use the System.Numerics.BigInteger class. See documentation here: http://msdn.microsoft.com/en-us/library/system.numerics.biginteger(v=vs.110).aspx
Another alternative is the IntX class.
IntX is an arbitrary precision integers library written in pure C# 2.0 with fast - O(N * log N) - multiplication/division algorithms implementation. It provides all the basic operations on integers like addition, multiplication, comparing, bitwise shifting etc.
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F# also ships with one. You can get it at Microsoft.FSharp.Math.
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