#include <iostream.h>

class mystack
{private:
   int A[100];   // array used for stack
   int tos;      // top of the stack

 public:

   mystack()
     { tos = -1; }  // -1 means empty stack

   void push(int x)
   { if (tos<99) tos++; 
     A[tos] = x;
   }

   void pop()
     { if (tos>=0) tos--; }

   int peek()
     { if (tos>=0) return A[tos]; }
 };

void main()
{ mystack* s1;
  s1 = new mystack();
  s1->push(3);
  s1->push(4);
  s1->pop();
  cout << s1->peek()  << "\n";
}