Best bignum library to solve Project Euler problems in C++? [closed]
Here are a couple of links regarding GMP and Visual Studio 2008: GMP Install Help at CodeGuru GMP Compile Guide at The Edge Of Nowhere (this one looks really thorough)
bignum
How can I represent a very large integer in .NET?
.NET 4 has a BigInteger class Represents an arbitrarily large signed integer. The BigInteger type is an immutable type that represents an arbitrarily large integer whose value in theory has no upper or lower bounds. This type differs from the other integral types in the .NET Framework, which have a range indicated by their MinValue … Read more
What is the standard (or best supported) big number (arbitrary precision) library for Lua?
Using lbc instead of lmapm would be easier because lbc is self-contained. local bc = require”bc” s=bc.pow(2,1000):tostring() z=0 for i=1,#s do z=z+s:byte(i)-(“0”):byte(1) end print(z)
What is the difference between Int and Integer?
“Integer” is an arbitrary precision type: it will hold any number no matter how big, up to the limit of your machine’s memory…. This means you never have arithmetic overflows. On the other hand it also means your arithmetic is relatively slow. Lisp users may recognise the “bignum” type here. “Int” is the more common … Read more
How to add 2 arbitrarily sized integers in C++?
Here’s an example showing how to use the OpenSSL bignum implementation for arbitrary-precision arithmetic. My example does 264 + 265. I’m using Linux. #include <cstdio> #include <openssl/crypto.h> #include <openssl/bn.h> int main(int argc, char *argv[]) { static const char num1[] = “18446744073709551616”; static const char num2[] = “36893488147419103232”; BIGNUM *bn1 = NULL; BIGNUM *bn2 = NULL; … Read more
Can long integer routines benefit from SSE?
In the past, the answer to this question was a solid, “no”. But as of 2017, the situation is changing. But before I continue, time for some background terminology: Full Word Arithmetic Partial Word Arithmetic Full-Word Arithmetic: This is the standard representation where the number is stored in base 232 or 264 using an array … Read more
Arbitrary-precision arithmetic Explanation
It’s all a matter of adequate storage and algorithms to treat numbers as smaller parts. Let’s assume you have a compiler in which an int can only be 0 through 99 and you want to handle numbers up to 999999 (we’ll only worry about positive numbers here to keep it simple). You do that by … Read more
How to deal with big numbers in javascript [duplicate]
While looking for an big integer library for an ElGamal crypto implementation I tested several libraries with the following results: I recommend this one: Tom Wu’s jsbn.js (http://www-cs-students.stanford.edu/~tjw/jsbn/) Comprehensive set of functions and fast Leemon Baird’s big integer library (http://www.leemon.com/crypto/BigInt.js) Comprehensive set of functions and pretty fast BUT: Negative number representation is buggy! bignumber.js (https://github.com/MikeMcl/bignumber.js) … Read more
Working with large numbers in PHP
For some reason, there are two standard libraries in PHP handling the arbitrary length/precision numbers: BC Math and GMP. I personally prefer GMP, as it’s fresher and has richer API. Based on GMP I’ve implemented Decimal2 class for storing and processing currency amounts (like USD 100.25). A lot of mod calculations there w/o any problems. … Read more
How to implement big int in C++
A fun challenge. 🙂 I assume that you want integers of arbitrary length. I suggest the following approach: Consider the binary nature of the datatype “int”. Think about using simple binary operations to emulate what the circuits in your CPU do when they add things. In case you are interested more in-depth, consider reading this … Read more