using namespace std;
#include <iostream>
#include <cmath>
#include <cstdlib>
#include <cstddef>
#include <fstream>
#include <cctype>
#include <ctime>

enum Error_code {success, fail, range_error, underflow, overflow, 
		fatal, not_present, duplicate_error, entry_inserted, 
		entry_found, internal_error};