#include <iostream>
using namespace std;
class stack
{
    private:
        int arr[5];
        int top;
    public:
        stack()
        {
            top = -1;
        }
        void push ( int v )
        {
            if ( top == 4 )
                { cout << "stack is full" << endl; }
            else
                {
                    arr[++top] = v;
                    cout << "data push successfully" << endl;
                }
        }
        int pop()
        {
            if ( top == -1 )
                {
                    cout << "stack empty" << endl;
                    return 0;
                }
            else
                { return arr[top--]; }
        }
};
int main()
{
    stack s;
    s.push ( 10 );
    cout << s.pop() << endl;
    return 0;
}