#include <iostream>
using namespace std;
struct node{
int value;
struct node* next;
};
class Stack
{
struct node *top;
public:
Stack()
{
top = NULL;
}
void push(int value)
{
struct node *temp = new struct node;
if(top==NULL)
{
temp->value = value;
temp->next = NULL;
top = temp;
}
else
{
temp->value = value;
temp->next = top;
top = temp;
}
}
int pop()
{
int value = top->value;
struct node *temp = top;
top = top->next;
free(temp);
return value;
}
int peek()
{
return top->value;
}
};
int main() {
Stack s1;
s1.push(5);
s1.push(6);
s1.push(7);
cout<<s1.pop()<<"\n";
cout<<s1.peek()<<"\n";
return 0;
}
