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Fixed-point equations #19

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@depler

How to implement arbitrary precision arithmetic with fixed point? Let's say we have this code:

var ctx = EContext.ForPrecision(5);
var a = EDecimal.FromString("2");
var b = a.Sqrt(ctx);

That means 5 total digits (both integer and fractional part), so it produces result 1.4142 which is not what I need. I want to call something like EContext.ForFixedPrecision(5) and always get results with 5 digits after point (while integer part remains unlimited). Is it possible?

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