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First you should state the correctness level you need. 0.2? 1/7? sqrt(2)+pi? int n=0, n<inf, sum(1/n^3)?

Look at the decimal type; it's less performant, but you'll avoid floating point issues.

https://docs.microsoft.com/en-us/dotnet/api/system.decimal?v...

decimal is still floating-point, just decimal floating-point instead of binary. Things like 1/3 can still not be represented exactly. It's just that for values given in base 10 there's no transformation of the representation and 0.3 remains exactly 0.3.

Yes I know the decimal type and it's what I use in all my code, I just thought the default would be something with more precision than double/float even if not decimal.

I'm not sure you appreciate how much performance would be lost...