Givaro
examples/Integer/iexponentiation.C

NO DOC

// Copyright(c)'1994-2009 by The Givaro group
// This file is part of Givaro.
// Givaro is governed by the CeCILL-B license under French law
// and abiding by the rules of distribution of free software.
// see the COPYRIGHT file for more details.
#include <iostream>
#include <givaro/modular-integer.h>
#include <givaro/givpower.h>
#include <givaro/givtimer.h>
using namespace Givaro;
// Modular exponentiation
// argv[1] : a
// argv[2] : e
// argv[3] : p
// res ---> a^e % p
int main(int argc, char ** argv) {
{
Integer p(argv[3]);
Modular<Integer>::Element a, b;
unsigned long e = (unsigned long)atoi(argv[2]) ;
Zp.init(a, Integer(argv[1]));
Zp.init(b);
Timer tim;tim.clear();tim.start();
dom_power(b, a, (long)e, Zp);
tim.stop();
Zp.write( std::cout << '(', a) << '^' << e << ") % " << p << '=' << std::flush;
Zp.write( std::cerr, b) << std::endl;
std::cerr << tim << std::endl;
}
return 0;
}