#include <iostream>
#include <string>
#include "node.h"
#include "globals.h"
#include <cmath>
#include "differentiatorNodes.h"
/*
 *Written by Jessica Smith from code adapted from code written by rcd.
 */

Key::Key (string key)
  : myKey(key),
    myPrecedence(KEY_PRECEDENCE),
    myValue(0)
{
}

Key:: ~Key (){}
// return the number
double Key:: evaluate () const
{
    return (myValue);
}
// print the number
string Key::description()const
{
    return(myKey);
}
void Key::print (ostream & out) const
{
    out << myKey;
}
// copy this node
Node * Key::copy () const
{
    return new Key(myKey);
}
int Key:: precedence()const
{
    return myPrecedence;
}