int RationalNumber::simplify()
{
    if ((d<0) && (n<0))
    {
        d=-1*d;
        n=-1*n;
    }
    if ((d<0) && (n>0))
    {
        n=n*-1;
        d=d*-1;
    }
    if (n==d)
    {
        n=1;
        d=1;
        return 0;

    }
    if (d==1)
    {
        return 0;
    }
    while (iseven(n) && iseven(d))
    {
        n=n/2;
        d=d/2;
    }
    int biggest;
    if (n!=0)
    {
        if (n>d)
        {
            biggest=n;
        }
        else if (n<d)
        {
            biggest=d;
        }
        int i=0;
        for (i=1;i<biggest;i++)
        {
            int z=i+1;
            if (div_n(n, z) && div_n(d, z))
            {
                n=n/z;
                d=d/z;
        //        std::cout << "Calling simple\n";
        //        std::cout << "Simplifying: " << n << "/" << d << "\n";
                simplify();
            }
        }
    }
    else
    {
        n=0;
        d=1;
    }
}