定义一个 k 函数,这样写正确吗？

我这里有一个程序的一部分，大家能帮我看一下这段程序正确吗？定义一个k函数,这样写正确吗？
double CF2DH_FieldCalc_316L::uf_k(long a_m, long a_l,long double  r,long double x)
{

    double k,T;
    T = m_T[1][a_m][a_l];
    x = m_det_x*a_l;      //m_det_x是一个定值，前面已经定义了，a_l是一个变量，,是从1-10000
        r = m_det_r*a_m;          //m_det_x是一个定值，前面已经定义了，a_m是一个变量，,是从1-10000
    if (x < sSpecimen.dMB_x)  
    {
        if (r < sSpecimen.dMB_r)
        {
            if ( T <=  660)
        {
            k =240.50-0.0065437*T-0.000059278*T*T;
        }
           else
        {
            k =61.1476;
        }
        }
        else
        {
           if ( T <=  660)
        {
            k =240.50-0.0065437*T-0.000059278*T*T;
        }
           else
        {
            k =61.1476;
        }
        }
    }
  else
    {
        if (r < sSpecimen.dMB_r)
        {
            if ( T <= 1398)
        {
            k =12.309 + 0.0168/T/T/T-0.0000031592*T*T;
        }
            else
        {
            k =29.62097;
        }
        }
        else
        {
            if ( T <= 1398)
        {
            k =12.309 + 0.0168/T/T/T-0.0000031592*T*T;
        }
            else
        {
            k =29.62097;
        }
        }
    }

       return k;

}