用的是dev c++为什么多文件不可以编译呢

#include<iostream>
#include<stdlib.h>
#include"MyStack.h"
#include"Coordinate.h"

using namespace std;

/*   MyStack(int size);//分配内存初始化栈空间，设定栈容量，栈顶
   ~MyStack();       //回收栈空间内存
   bool stackEmpty();//判定栈是否为空，为空返回true,非空返回false
   bool stackFull();//定栈是否满，为满返回true,不满返回false
   void clearStack();//清空栈
   int stackLength();//已有元素个数
   void push(char elem);//元素入栈，栈顶上升
   char pop(char &elem);//元素出栈，栈顶下降
   void stackTraverse();//遍历栈中所有元素
   */
   int main()
   {

       MyStack *pStack = new MyStack(5);

       pStack->push(Coordinate(1,2));//底
       pStack->push(Coordinate(3,4));
       //pStack->push(Coordinate(5,6));
       //pStack->push(Coordinate(7,8));
   //   pStack->push(Coordinate(9,10));

       pStack->stackTraverse(true);
       cout << endl;

       pStack->stackTraverse(false);
       cout << endl;


   //   pStack->clearStack();

       cout << pStack->stackLength() << endl;

       if(pStack->stackEmpty())
       {
           cout << "栈为空"<< endl;
       }

       if(pStack->stackFull())
       {
           cout <<"栈为满"<< endl;
       }

       delete pStack;
       pStack = NULL;


       system("pause");
       return 0;
   }