flint3-sys 3.6.0

Rust bindings to the FLINT C library
Documentation 
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/*
    Copyright (C) 2016 Vincent Delecroix

    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 "test_helpers.h"
#include "fmpz_poly.h"

TEST_FUNCTION_START(fmpz_poly_has_real_root, state)
{
    slong iter;

    /* test on polynomial without roots */
    for (iter = 0; iter < 100; iter++)
    {
        fmpz_poly_t p;

        fmpz_poly_init(p);

        do{
            fmpz_poly_randtest_no_real_root(p, state, 50, 1 + n_randint(state, 100));
        } while (!fmpz_poly_is_squarefree(p));

        if(fmpz_poly_has_real_root(p))
        {
            printf("FAIL:\n");
            printf("polynomial with no real root p = ");
            fmpz_poly_print(p); printf("\n");
            abort();
        }

        fmpz_poly_clear(p);
    }

    for (iter = 0; iter < 100; iter++)
    {
        fmpz_poly_t p;
        int ans;
        slong n,n2;

        fmpz_poly_init(p);

        do{
            fmpz_poly_randtest_not_zero(p, state, 50, 1 + n_randint(state, 100));
        } while(!fmpz_poly_is_squarefree(p));

        n = fmpz_poly_num_real_roots_sturm(p);
        n2 = fmpz_poly_num_real_roots_vca(p);
        ans = fmpz_poly_has_real_root(p);
        if ((n > 0) != ans)
        {
            printf("FAIL:\n");
            printf("p = "); fmpz_poly_print(p); printf("\n");
            flint_printf("n = %wd n2 = %wd\n", n, n2);
            flint_printf("ans = %wd\n", ans);
            abort();
        }
        fmpz_poly_clear(p);
    }


    TEST_FUNCTION_END(state);
}