C Better way to calculate percent for chicken settings?

Code

BYTE CalcPercent(DWORD dwVal, DWORD dwMaxVal, BYTE iMin)

{

    if (dwVal == 0 || dwMaxVal == 0)

        return NULL;



    BYTE iRes = (BYTE)((double)dwVal / (double)dwMaxVal * 100.0);



    if (iRes > 100)

        iRes = 100;



    return max(iRes, iMin);

}

Code

BOOL TriggerTown()

{

    if (!ClientReady(TRUE))

        return FALSE;



    DOUBLE LifePercent = CalcPercent((GetUnitStat(Me, STAT_HP) >> 12), (GetUnitStat(Me, STAT_MAXHP) >> 12));

    DOUBLE ManaPercent = CalcPercent((GetUnitStat(Me, STAT_MANA) >> 8), (GetUnitStat(Me, STAT_MAXMANA) >> 8));



    if (!V_DelayedChicken && !InTown(Me) && !GetUnitState(Me, AFFECT_WHIRLWIND))

    {

        if (V_HiddenValues == TRUE)

        {

            if (V_LifeTownPercent > 0 && LifePercent <= V_LifeTownPercent + 10)

                Town();



            return FALSE;

        }



    {

        if (V_HiddenValues == FALSE)

        {

            if (V_LifeTownPercent > 0 && LifePercent <= V_LifeTownPercent)

                Town();



            return FALSE;

        }

    }

}

    return TRUE;

}