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#include <iostream>using namespace std;//类的定义，指明了接口class xstack{public:xstack();//构造函数void push(int);void pop();int & top();//栈顶元素void print();int data[10];int sp;};//构造函数xstack::xstack(){sp = -1;}//用于入栈的函数void xstack::push(int k){data[++sp] = k;}//用于出栈的函数void xstack::pop(){sp--;}//int & xstack::top(){return data[sp];}//用于打印输出的函数void xstack::print(){cout << "--------------" << endl;cout << "sp=" << sp << endl;for(int i=0; i<=sp; i++)cout << data[i] << endl;}int main(){xstack s;s.push(4);s.push(5);s.push(6);s.top() = 10;s.print();//cout << "top =" << s.top << endl;}