I wanted to implement Miller Rabin Primality Test for large numbers. I wanted to know how to deal with such huge numbers in C++. Should I write any special function to store and process those large numbers or care is taken automatically?
128 bit Miller Rabin Primality test
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You should use an arbitrary precision library. Since you only need integers, GMP is a very popular and well-maintained such library. It has a nice C++ interface provided by
<gmpxx.h>.