bignum with floating point

Hi,

I want to program a bignum library in C just for learning,
it doesn't seem too hard (I don't care about speed) when
considering just integer numbers, but when I add support
for division and need floating point numbers I doesn't
look so easy anymore. I wonder if it's hard to do this.
Is there some easy trick to do this? Can I just round
off some fixed digits to the right of the decimal-point?
Or do I need to get a deep understanding of
floating point representations and IEEE standards?

Thanks!

.

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