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/*
* http://gmplib.org/
*
* gcc gcd-gmp.c -o gcd-gmp -lgmp
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <gmp.h>
void
gcd2 (mpz_t r, mpz_t a1, mpz_t b1)
{
mpz_t a, b;
mpz_init_set (a, a1);
mpz_init_set (b, b1);
while (mpz_sgn (b) != 0)
{
mpz_set (r, b); /* r = b; */
mpz_mod (b, a, b); /* b = a % b; */
mpz_set (a, r); /* a = r; */
}
mpz_set (r, a);
mpz_clear (a);
mpz_clear (b);
}
void
gcdn (mpz_t r, mpz_t a[], size_t n)
{
size_t i;
mpz_set (r, a[0]);
for (i = 1; i < n; i++)
gcd2 (r, r, a[i]); /* mpz_gcd ;-) */
}
int
main (int argc, char *argv[])
{
mpz_t *a, g;
int i, n;
if (argc > 1)
{
n = argc - 1;
a = (mpz_t *) malloc (n * sizeof (mpz_t));
if (!a)
return EXIT_FAILURE;
for (i = 1; i <= n; i++)
mpz_init_set_str (a[i - 1], argv[i], 10);
mpz_init (g);
gcdn (g, a, n);
mpz_out_str (NULL, 10, g);
printf ("\n");
mpz_clear (g);
for (i = 1; i <= n; i++)
mpz_clear (a[i - 1]);
free (a);
}
return EXIT_SUCCESS;
}
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