public Operation(int nTail, int nHead, int nOperation) { m_nHead = nHead; m_nTail = nTail; m_nOperation = nOperation; }
public Operation() { }
	    public Operation(int nTail, int nHead, int nOperation) {			m_nHead = nHead;			m_nTail = nTail;			m_nOperation = nOperation;		}