rulechain.cpp

来自「基于专家系统应用的程序代码 使用vc编程,access为数据库的程序」· C++ 代码 · 共 110 行

// RuleChain.cpp: implementation of the RuleChain class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "mineDabse.h"
#include "RuleChain.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

RuleChain::RuleChain()
{//无头结点
   head=NULL;
}

RuleChain::~RuleChain()
{
   DestroyChain();
}

////////////////
void RuleChain::DestroyChain(){
    RuleNode* nodeTemp;	    
	while(NULL!=head){
	 nodeTemp=head->next;
	 delete head;
	 head=nodeTemp;
	}
}
//////////
void RuleChain::appendRule(CString&name,CString &pre,CString &con,bool flag)
{
    RuleNode* nodeTemp=new RuleNode(name,pre,con,flag),*p;	
	p=head;
	if(p==NULL){
		head=nodeTemp;
		nodeTemp->next=NULL;
	}
	else{
		while(NULL!=p->next){
			p=p->next;		
		}
		nodeTemp->next=p->next;	
		p->next=nodeTemp;
	}

}
//////////////////////
void RuleChain::deleteRule(CString* name)
{
   RuleNode* nodeTemp=NULL,*pNode=NULL;
   nodeTemp=head; 
   while((nodeTemp->name.Compare(*name))&&(nodeTemp!=NULL)){
     nodeTemp=nodeTemp->next;//没找到要删除的节点，goon
   }
   if(!nodeTemp){
     AfxMessageBox("没有要删除的节点");
	 return;
   }
   pNode=nodeTemp->next;//pNode指向要删除的RuleNode节点
   nodeTemp->next=pNode->next;
   delete pNode;
}

///////////////

bool RuleChain::isEmpty()
{
  if (head==NULL){
	  // AfxMessageBox("链表空！");
	   return true;
   }
  else return false;
}



RuleNode* RuleChain::nextRule(RuleNode* node)
{
  //if(node->next!=NULL)
	return node->next;
}

RuleNode* RuleChain::getFirstRule()
{
	return head;
}

RuleNode::RuleNode(CString name,CString premise,CString con,bool flag)
{/*nodeTemp->name=name;
	nodeTemp->premise=pre;
	nodeTemp->conclusion=con;
	nodeTemp->flag=flag;
	nodeTemp->next=NULL;*/
this->name=name;
this->premise=premise;
this->conclusion=con;
this->next=NULL;
this->flag=flag;
}