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biginteger - What is the best way to represent arbitrarily big numbers in c?

I'm working on a project that requires me to work with numbers larger than the largest numerical datatype in c. I was thinking of using structs with bit fields to represent this, but it's already smelling bad. Anyone got any tips? (Not looking for a library, more of a thought process to go behind doing something like this.)

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The GNU MP Bignum Library would be my first choice.


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