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#include <stdlib.h>
#include <stdio.h>
static unsigned long int gcd2(unsigned long int a, unsigned long int b)
{
unsigned long int c;
while (b != 0) {
c = b;
b = a % b;
a = c;
}
return a;
}
static unsigned long int gcdn(unsigned long int *a, size_t n)
{
unsigned long int r;
size_t i;
r = a[0];
for(i = 1; i < n; i++) {
r = gcd2(r, a[i]);
}
return r;
}
int main (int argc, char *argv[])
{
unsigned long int *a;
size_t i, n;
if (argc > 1) {
n = (size_t)(argc - 1);
a = (unsigned long int*) malloc(sizeof(unsigned long int) * n);
if (NULL != a) {
for (i = 1; i <= n; i++)
a[i-1] = strtoul(argv[i], NULL, 10);
printf("%lu\n", gcdn(a, n));
free(a);
return EXIT_SUCCESS;
}
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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