// Print Object Function for CS 51 Introduction to C
//
// File:	print_object.cc
// Author: 	<your name> (<your e-mail address>)
// Assignment:	c

// This file contains the print object function for
// programming the CS 51 LISP assignments in C++.

#include "intro51.h"

// Pseudo-code:
//
// if ob == NULL then print "NULL"
// else if ob->type is SYMBOL then print ob->name;
// else if ob->type is INTEGER then print ob->value;
// else if ob->type is CONS then
// {
//	print "("
//	print_object ob->car 
//	while ( ob->cdr is a CONS )
//	{
//	    print " "
//	    set ob = ob->cdr
//	    print_object ob->car
//	}
//	if ( ob->cdr is not NIL )
//	{
//	    print " "
//	    print "."
//	    print " "
//	    print_object ob->cdr
//	}
//	print ")"
// else print "BAD OBJECT"
// }

ostream & operator << ( ostream & s, object * ob )
{
    if ( ob == NULL ) s << "NULL";

    else if ( ob->type == SYMBOL ) s << ob->name;

    else if ( ob->type == INTEGER ) s << ob->value;

    else if ( ob->type == CONS )
    {
	// Replace this line with your code.
    }

    else s << "BAD OBJECT";

    return s;
}