#include <stdlib.h>

/* Define a new type called Number that stores a large number */
typedef char *Number;

#ifdef NUMBER_SIZE // If this constant is defined then define the variable
int SIZE = 10; // Maximum number of digits in a number: to be set
#endif
#ifndef NUMBER_SIZE // if this constant is not defined then declare the variable
extern int SIZE;
#endif

/* Function declarations */
// Functions defined in numbers-io.c
int read_number();
void output_number();
char skip_blanks();
void set_number();
void copy_number();

// Functions defined in numbers-space.c
Number allocate_space();
void free_space();
void set_number_size();

// Functions defined in numbers-add.c
void add_numbers();
void number2modular();