程序代码：

#include<iostream>
#include<cassert>
using namespace std;

template<class T,int SIZE=10>
class Stack{
private:
    T list[SIZE];
    int top;
public:
    Stack();
    void push(const T &item);
    T pop();
    void clear();
    const T &peek() const;
    bool isFull() const;
    bool isEmpty()const;
};

template<class T,int SIZE>
Stack<T,SIZE>::Stack:top(-1){}

template<class T,int SIZE>
void Stack<T,SIZE>::push(const T &item){
    assert(!isFull());
    list[++top]=item;
}

template<class T,int SIZE>
T Stack<T,SIZE>::pop(){
    assert(!isEmpty());
    return list[top--];
}

template<class T,int SIZE>
const T &Stack<T,SIZE>peek()const {
    assert(!isEmpty());
    return list[top];
}

template<class T,int SIZE>
bool Stack<T,SIZE>::isEmpty()const{
    return top==SIZE-1;
}

template<class T,int SIZE>
void Stack<T,SIZE>clear(){
    top=-1;
}


int main () {
    Stack<int>a;
    a.push(1); //将123压入
    a.push(2);
    a.push(3);
    a.pop();//将123弹出来
    a.pop();
    a.pop();
    Stack<char>b;
    b.push(a);//将a压入
    b.pop();//将a弹出
    return 0;
}