#include <openssl/bn.h>

int
main(void)
{
        BIGNUM *z, *mz;
        z = BN_new();
        if (BN_zero(z) == 0)
                return (1);

        mz = BN_new();
        if (BN_dec2bn(&mz, "-0") == 0)
                return (1);

        printf("BN_is_zero(BN_zero()): %s\n", BN_is_zero(z) ? "yes" : "no");
        printf("BN_is_zero(BN_dec2bn(\"-0\")): %s\n", BN_is_zero(mz) ? "yes" : "no");
        printf("BN_cmp(BN_zero(), BN_dec2bn(\"-0\")): %d\n", BN_cmp(z, mz));
        return (0);
}