html元素自定义属性:C++问题，关于链表的

void printlk(LinkList &L) {
LinkList p;
p=L->next;
while(p){cout<<p->data;p=p->next;}
。。。。。。。。。。。。。。。。。。。。。。。。。。。。
while (done) {
MenuList( );
cout<<"input the operating code : ";
cin>>select;
switch(select){
case 1: Insert(La);break;
case 2: Insert(Lb);break;
case 3: Delete(La);break;
case 4: Delete(Lb);break;
case 5: Union(La,Lb);break;
case 6: MergeList(La,Lb,&Lc);
cout<<"LC: ";printlk(Lc);
break;
case 7: cout<<"LA: ";printlk(La);
cout<<"LB: ";printlk(Lb);
break;
case 8: done=0;break;
default: cout<<"ERROR"<<endl;
}
出错提示：: error C2664: 'printlk' : cannot convert parameter 1 from 'struct LNode ** ' to 'struct LNode *'
error C2664: 'printlk' : cannot convert parameter 1 from 'struct LNode ** ' to 'struct LNode *'
请高手帮忙解决问题所在，并说明原因，改正一下~~~