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/*
* SYNOPSIS:
*
* # g++ -o gcd-cpp gcd.cpp
* # ./gcd-cpp 11 22 33 121
* # 11
*
*
* To use GNU Multiple Precision Arithmetic Library:
*
* # g++ -o gcd-cpp-gmp -DGMP -lgmpxx -lgmp gcd.cpp
* # ./gcd-cpp-gmp 1234567890987654321 987654321234567
* # 63
*
*/
#include <cstdlib>
#include <iostream>
#include <vector>
#include <sstream>
using namespace std;
#ifdef GMP
#include <gmpxx.h>
typedef mpz_class Number;
#else
typedef unsigned int Number;
#endif // GMP
typedef vector<Number> Numbers;
Number gcd(Number a, Number b)
{
Number c;
while (b != 0) {
c = b;
b = a % b;
a = c;
}
return a;
}
Number gcd(const Numbers & ns)
{
Number r = 0;
for(Numbers::const_iterator n = ns.begin(); n != ns.end(); ++n)
r = gcd(*n, r);
return r;
}
int main (int argc, char *argv[])
{
if (argc > 1) {
Numbers ns(argc - 1);
for(int n = 1; n < argc; ++n) {
stringstream str;
str << argv[n];
str >> ns[n-1];
/* NOTE:
* For GMP we can just assign: ns[n-1] = argv[n],
* and sstream is not needed.
*/
}
cout << gcd(ns) << endl;
}
return EXIT_SUCCESS;
}
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