The tutorial doesn't really tell you how wonderfully easy it is to use gmp in
c++.
If you want a factorial function, say:
mpz_class fact(unsigned int n)
{
if (n==0) return 1;
return n*fact(n-1);
}
If you want to print a big factorial number,
cout << fact(40);
Most of the time you can you can declare integer variables as
mpz_class x;
and then write code as if they were ordinary integers.
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