#include "Stack.h"
bool Stack::Push(SType d) 
{
   if (Top == SSize)
     return false;
   else {
      data[Top] = d;
      Top++;
      return true;
   }
}

bool Stack::Pop(SType &d) 
{
   if (!Top)
      return false;
   else {
      Top--;
      d = data[Top];
      return true;
   }
}

bool Stack::StackTop(SType &d)
{
   if (!Top)
     return false;
   else {
      d = data[Top-1];
      return true;
   }
}