examples/Integer/nb_primes.C

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// 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/givintprime.h"
#include "givaro/givtimer.h"
using namespace Givaro;
inline Integer GIVMAX(const Integer& a, const Integer& b) { return (a<b?b:a); }
int main(int argc, char** argv)
{
IntPrimeDom IPD;
Integer m, tp = 2, ttp=1, np;
if (argc > 1)
np = Integer(argv[1]);
else
std::cin >> np;
if (argc > 2)
m = GIVMAX(1,Integer(argv[2]));
else
m = 2;
Integer nf = m;
unsigned long long nb = (IPD.isprime(m)?1:0);
Timer tim; tim.clear(); tim.start();
for (;m < np; tp *= 2) {
std::cout << nb << " primes between " << nf << " and " << m << "\t\t == nextprime(" << (ttp+nf-1) << ")" << std::endl; ttp = tp;
for (;(m < np) && (m < (nf+tp)); ++nb)
IPD.nextprimein(m);
}
tim.stop();
std::cout << (m>np?nb-1:nb) << " primes between " << nf << " and " << np << std::endl << tim << std::endl;
return 0;
}
/* -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// vim:sts=4:sw=4:ts=4:et:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s
Givaro::IntPrimeDom
Primality tests.
Definition givintprime.h:67
Givaro::Integer
This is the Integer class.
Definition gmp++_int.h:160
Givaro::Timer
Timer.
Definition givtimer.h:129
Givaro::Timer::start
void start()
Start timer.
Definition givtimer.C:164
Givaro::Timer::stop
void stop()
Stop timer.
Definition givtimer.C:172
Givaro::Timer::clear
void clear()
Clear timer.
Definition givtimer.C:155
Givaro
Namespace in which the whole Givaro library resides.
Definition all_field.C:23