//queue.h
const int size=10;
class Queue{
    public:
    void Init();
    void EnQueue(int newEleme);
    int DelQueue();
    int GetLength(){
        return length;}
    void Print();
    private:
    int elem[size];
    int length;
    int first;
    };
//queue.cpp
#include <iostream.h>
#include "queue.h"
void Queue::Init()
{int first=length=0;
}
void Queue::EnQueue(int newElem)
{int pos=(first+length);
 elem[pos]=newElem;
 length++;
}
int Queue::DelQueue()
{int ret=elem[first];
 first=first+1;
 length--;
 return ret;
}
void Queue::Print()
{ int pos=first;
   cout<<"Queue:";
   for(int i=0;i<length;i++,pos++)
   {cout<<elem[pos];
   }
   cout<<endl;
}
//main.cpp
#include <iostream.h>
#include "queue.h"
void main()
{ Queue q;
  int i;
  cout<<"Initial state:"<<endl;
  q.Init();
  cout<<"Queue length="<<q.GetLength()<<endl;
  q.Print();
  cout<<"Adding"<<size<<"elements"<<endl;
  for(i=0;i<size;i++)
  q.EnQueue(i);
  cout<<"Queue length="<<q.GetLength()<<endl;
  q.Print();
}
分别编写queue.h,queue.cpp,main.cpp 三个程序，运行main.cpp
出现以下错误：
error LNK2001:unresolved external symbol "public: void__this Queue::EnQueue(int)"(?EnQueue@Queue@QAEXH@Z)
error LNK2001:unresolved external symbol "public: void__this Queue::Print(void)"(?Print@Queue@QAEXXZ)
error LNK2001:unresolved external symbol "public: void__this Queue::Init(void)"(?Init@Queue@QAEXXZ)

[[it] 本帖最后由 s1y2z3 于 2008-12-7 11:04 编辑 [/it]]

我改了一下，不是这种情况！