g++编译链接多个文件

头文件 mystack.h

/**
 * File mystack.h
 * Declare class Stack
 **/
#ifndef MYSTACK_H
#define MYSTACK_H

#include <iostream>
using namespace std;

enum Error_code { success, fail, underflow, overflow };
typedef char Stack_entry;

const int maxstack = 10;

class Stack
{
public:
    Stack();
    bool empty() const;
    Error_code pop();
    /**
     * the top of the Stack is returned in item
     **/
    Error_code top(Stack_entry& item) const;
    Error_code push(const Stack_entry& item);
    
private:
    int count;
    Stack_entry entry[maxstack];
};


#endif

库文件 mystack.cpp

/**
 * File mystack.cpp
 **/

#include "mystack.h"
#include <iostream