What is the best algorithm for mathematical operations of "huge" numbers?

Question

Mathematics

I'm playing with swift algorithms, I need to work with huge numbers (for example, you need to sum 10e-400 + 124e-40) What is the best method to implement string summation? For myself, I singled out summation in the binary system, but you can do it the way you were taught at school (as on a "leaflet" (an ordinary column)). So I'm wondering which one would be better. Tell?

Answer 1

Read about BigInt implementation
https://github.com/ibiwan/swift-bigint/blob/master... - here's an example.

Answer 2

Don't reinvent the wheel. Or at least look at how they are implemented. The same OpenSSL contains an implementation of long arithmetic.