#include<bits/stdc++.h>
#define n 5
using namespace std;
class Stack{
int *a;
int top;
public:
Stack(){
a = new int[n];
top = -1;
};
void push(int x){
if(top == n -1){
cout<<"Stack overflow"<<endl;
return;
}
top++;
a[top]=x;
}
void pop(){
if(top ==-1){
cout<<"No element in pop"<<endl;
return;
}
top--;
}
int Top(){
if(top==-1){
cout<<"NO element on stack"<<endl;
return-1;
}
return a[top];
}
bool empty(){
return top==-1;
}
};
int main()
{
Stack st;
st.push(1);
st.push(2);
st.push(3);
cout<<st.Top()<<endl;
st.pop();
cout<<st.Top()<<endl;
st.pop();
st.pop();
st.pop();
cout<<st.empty()<<endl;
return 0;
}
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