#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* one can define 'global' data types, variables, and constants here */

#define MAX_STRLEN 80  // maximum length of an unknown string
#define WRD_LENGTH 32  // per word 
#define MAX_COURSE 5   // number of courses per student

#define FALSE 0
#define TRUE  1

/* the following is a C structure to hold course information */
struct course_info {
  char course[WRD_LENGTH];// in the form of 'CSCI 315', 8 chars, plus '\0'
  char * title;     // variable length string
  char * prof;      // professor name, variable length
  char time[WRD_LENGTH];// in the form of 'MWF 08:00-09:00', 16 chars, plus '\0'
  char * room;      // classroom, variable length
  float credit;     // 1.0, 0.5, 0.25, etc.
  int enrollment;   // number of students allowed in class
  struct course_info * next;  // link to next node
};

/* The following is a structure for list */
struct list {
  struct course_info * head;
  struct course_info * tail;
};

/* function prototypes */
struct course_info * make_node();
int isEmpty(struct list * );
void insert(struct course_info *, struct list **);