flint-sys 0.9.0

Bindings to the FLINT C library
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

/*
    Copyright (C) 2016 Pascal Molin

    This file is part of FLINT.

    FLINT is free software: you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.  See <https://www.gnu.org/licenses/>.
*/

#include "dirichlet.h"

int
dirichlet_parity_ui(const dirichlet_group_t G, ulong a)
{
    int par;

    par = 0;

    if (G->neven && a % 4 == 3)
        par++;

    if (n_jacobi_unsigned(a, G->rad_q) == -1)
        par++;

    return par % 2;
}