1 /** @file time_lw_A.cpp
3 * Test A from the paper "Comparison of Polynomial-Oriented CAS" by Robert H.
4 * Lewis and Michael Wester. */
7 * GiNaC Copyright (C) 1999-2009 Johannes Gutenberg University Mainz, Germany
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 using namespace GiNaC;
32 static unsigned test()
34 for (int i=1; i<=99; ++i)
35 factorial(1000+i)/factorial(900+i);
36 ex rat(factorial(1100)/factorial(1000));
38 if (abs(evalf(rat)-numeric(".13280014101512E303"))>numeric("1.0E289")) {
39 clog << "1100!/1000! erroneously returned " << rat << endl;
52 cout << "timing Lewis-Wester test A (divide factorials)" << flush;
55 // correct for very small times:
59 } while ((time=rolex.read())<0.1 && !result);
61 cout << time/count << 's' << endl;
66 extern void randomify_symbol_serials();
68 int main(int argc, char** argv)
70 randomify_symbol_serials();
71 cout << setprecision(2) << showpoint;