private:
void Trace(string strString)
void TraceD(string strString)
void Trace(int nValue)
void TraceD(int nValue)
void Trace(unit)
void TraceD(unit)
int  Rand(int nRand)
int  sqrt(int nVal)
void TurnRadiusByAngle(int nR, int nAngle, int& pDx, int& pDy)
int  Distance(int nX, int nY, int nX2, int nY2)