#ifndef _NODE_H // checks for the existence of a symbol if it does exist skip s$
#define _NODE_H // defines _NODE_H
#include <cstdlib> // same thing as <stdlib.h>

class Node
{
        public:

                Node();
                Node(int);
                void setvalue(int);
                int getvalue();
        private:

                int value;
};
#endif // closes the ifndef