求问大神们，下面这个栈的操作哪里出问题了？？？求知识，急，初学者，数据结构、、、、

SeqStack.h
#ifndef SeqStack_H
#define SeqStack_H

const int StackSize=10;
template<class T>

class SeqStack
{
public:
    SeqStack(){top=-1;}
    ~SeqStack(){}
    void push(T x);
    T pop();
    T GetTop();
    int Empty();
private:
    T data[StackSize];
    int top;
}
#endif

SeqStack.cpp
#include"SeqStack.h"
template <class T>
void SeqStack<T>::push(T x)
{
    int top;
    if(top==StackSize-1)throw"上溢";
    data[++top]=x;
}

template <class T>
T SeqStack<T>::pop()
{
    T x;
    if(top==-1)throw"下溢";
    else
        x=data[top--];
    return x;
}

template <class T>
T SeqStack<T>::GetTop()
{
    if(top==-1)throw"下溢";
    else
        return data[top];
}

template <class T>
int SeqStack<T>::Empty()
{
    if(top==-1)return 1;
    else return 0;
}


MainSeqStack.cpp


#include"SeqStack.cpp"
#include<iostream>
using namespace std;

void main()
{
    SeqStack<int>a;
    cout<<"执行压栈操作:"<<endl;
    try
    {
        a.push(1);
        a.push(2);
        a.push(3);
        a.push(4);
    }
    catch(char* wrong)
    {
        cout << wrong;     //如失败提示失败信息
    }
    cout<<"已经插入“1，2，3，4”"<<endl;
    cout<<"执行判断栈是否为空操作："<<endl;
    cout<<a.Empty()<<endl;
    cout<<"执行出栈操作："<<endl;
    cout<<a.pop()<<endl;
    cout<<"弹出栈顶元素："<<endl;
    cout<<a.GetTop()<<endl;
}