How would you declare a large number in GMP?

Question

How would you declare a large number that is 128 bits in GMP with the #include <gmp.h>? This number is an integer.

Answer 1

Use mpz_set_str to initialize to an ascii value.

mpz_t N;
mpz_init(N);
mpz_set_str(N, "55555555555555555555555555555");