int main()
{
slong iter;
flint_rand_t state;
flint_printf("overlaps....");
fflush(stdout);
flint_randinit(state);
for (iter = 0; iter < 100000; iter++)
{
fmprb_t a, b;
fmpq_t am, ar, bm, br, t, u;
int c1, c2;
fmprb_init(a);
fmprb_init(b);
fmpq_init(am);
fmpq_init(ar);
fmpq_init(bm);
fmpq_init(br);
fmpq_init(t);
fmpq_init(u);
fmprb_randtest(a, state, 1 + n_randint(state, 500), 14);
fmprb_randtest(b, state, 1 + n_randint(state, 500), 14);
fmpr_get_fmpq(am, fmprb_midref(a));
fmpr_get_fmpq(ar, fmprb_radref(a));
fmpr_get_fmpq(bm, fmprb_midref(b));
fmpr_get_fmpq(br, fmprb_radref(b));
fmpq_sub(t, am, bm);
fmpz_abs(fmpq_numref(t), fmpq_numref(t));
fmpq_add(u, ar, br);
c1 = fmprb_overlaps(a, b);
c2 = (fmpq_cmp(t, u) <= 0);
if (c1 != c2)
{
flint_printf("FAIL:\n\n");
flint_printf("a = "); fmprb_print(a); flint_printf("\n\n");
flint_printf("b = "); fmprb_print(b); flint_printf("\n\n");
flint_printf("am = "); fmpq_print(am); flint_printf("\n\n");
flint_printf("ar = "); fmpq_print(ar); flint_printf("\n\n");
flint_printf("bm = "); fmpq_print(bm); flint_printf("\n\n");
flint_printf("br = "); fmpq_print(br); flint_printf("\n\n");
flint_printf("t = "); fmpq_print(t); flint_printf("\n\n");
flint_printf("u = "); fmpq_print(u); flint_printf("\n\n");
flint_printf("c1 = %d, c2 = %d\n\n", c1, c2);
abort();
}
fmprb_clear(a);
fmprb_clear(b);
fmpq_clear(am);
fmpq_clear(ar);
fmpq_clear(bm);
fmpq_clear(br);
fmpq_clear(t);
fmpq_clear(u);
}
flint_randclear(state);
flint_cleanup();
flint_printf("PASS\n");
return EXIT_SUCCESS;
}
int
main(void)
{
int i;
FLINT_TEST_INIT(state);
flint_printf("reconstruct_fmpz_2....");
fflush(stdout);
for (i = 0; i < 10000; i++)
{
int result;
int modresult;
int special_case;
fmpq_t x, y;
fmpz_t mod, res, N, D, t;
mpz_t tmp;
fmpq_init(x);
fmpq_init(y);
fmpz_init(mod);
fmpz_init(res);
fmpz_init(N);
fmpz_init(D);
fmpz_init(t);
mpz_init(tmp);
fmpq_randtest(x, state, 100);
fmpz_abs(N, fmpq_numref(x));
fmpz_set(D, fmpq_denref(x));
/* Randomly generate larger bounds */
if (n_randint(state, 2))
{
fmpz_randtest_not_zero(t, state, 100);
fmpz_abs(t, t);
fmpz_mul(N, N, t);
}
if (n_randint(state, 2))
{
fmpz_randtest_not_zero(t, state, 100);
fmpz_abs(t, t);
fmpz_mul(D, D, t);
}
fmpz_mul(mod, N, D);
fmpz_mul_ui(mod, mod, UWORD(2));
/* Next prime greater than or equal */
fmpz_get_mpz(tmp, mod);
flint_mpz_sub_ui(tmp, tmp, UWORD(1));
mpz_nextprime(tmp, tmp);
fmpz_set_mpz(mod, tmp);
modresult = fmpq_mod_fmpz(res, x, mod);
result = fmpq_reconstruct_fmpz_2(y, res, mod, N, D);
/* Special case: both 1 and -1 have residue 1 mod 2.
There's probably no particular reason to disallow this. */
special_case = (fmpz_cmp_ui(mod, UWORD(2)) == 0 &&
fmpz_get_si(&x->num) == WORD(-1) &&
fmpz_cmp_ui(&x->den, UWORD(1)) == 0);
if (special_case)
{
if (!modresult || !result ||
!fmpz_is_one(&y->num) || !fmpz_is_one(&y->den))
{
flint_printf("FAIL: special case: -1 mod 2\n");
abort();
}
}
else if (!modresult || !result || !fmpq_equal(x, y))
{
flint_printf("FAIL: reconstruction failed\n");
flint_printf("input = ");
fmpq_print(x);
flint_printf("\nmodulus = ");
fmpz_print(mod);
flint_printf("\nresidue = ");
fmpz_print(res);
flint_printf("\nreconstructed = ");
fmpq_print(y);
flint_printf("\nfmpq_mod_fmpz return value = %d", modresult);
flint_printf("\nfmpq_reconstruct_fmpz return value = %d", result);
flint_printf("\n");
abort();
}
fmpq_clear(x);
fmpq_clear(y);
fmpz_clear(mod);
fmpz_clear(res);
fmpz_clear(N);
fmpz_clear(D);
fmpz_clear(t);
mpz_clear(tmp);
}
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return 0;
}
