#ifndef FRAC_HEAP_H
#define FRAC_HEAP_H

typedef struct {
    signed char sign;
    unsigned int numerator;
    unsigned int denominator;
} fraction;


/*
 * init_heap():
 * must be called once by the program using your
 * functions before calls to any other functions are made. This
 * allows you to set up any housekeeping needed for your memory
 * allocator. For example, this is when you can initialize
 * your free block list.
 */
void init_heap(void);

/*
 * new_frac():
 * must return a pointer to fractions.
 * It should be an item taken from the list of free blocks.
 * (Don't forget to remove it from the list of free blocks!)
 * If the free list is empty, you need to get more using malloc()
 * (Number of blocks to malloc each time is specified in the project
 * description)
 */
fraction *new_frac(void);

/*
 * del_frac():
 * takes a pointer to a fraction and adds that item to the free block list.
 * The programmer using your functions promises to never use that item again,
 * unless the item is given to her/him by a subsequent call to new_frac().
 */
void del_frac(fraction *frac);

/*
 * dump_heap():
 * For debugging/diagnostic purposes.
 * It should print out the entire contents of the free list,
 * printing out the address for each item.
 */
void dump_heap(void);

#endif /* FRAC_HEAP_H */