/****************************************************************************
 * CS50 Library 2.1
 *
 * https://manual.cs50.net/Library
 *
 * Glenn Holloway <holloway@eecs.harvard.edu>
 * David J. Malan <malan@harvard.edu>
 *
 * Based on Eric Roberts' genlib.h and simpio.h.
 *
 * Creative Commons Attribution-ShareAlike 3.0 Unported License
 * http://creativecommons.org/licenses/by-sa/3.0/
 ***************************************************************************/

#ifndef _CS50_H
#define _CS50_H

#include <float.h>
#include <limits.h>
#include <stdbool.h>


/*
 * Don't mix garbage-collected allocation with the system malloc-free.
 */

#define calloc(m,n) GC_MALLOC((m)*(n))
#define free(p) GC_FREE(p)
#define malloc(n) GC_MALLOC(n)
#define realloc(p,n) GC_REALLOC((p),(n))


/*
 * Our own data type for string variables.
 */

typedef char *string;


/*
 * Reads a line of text from standard input and returns the equivalent
 * char; if text does not represent a char, user is prompted to retry.
 * Leading and trailing whitespace is ignored.  If line can't be read,
 * returns CHAR_MAX.
 */

char 
GetChar(void);


/*
 * Reads a line of text from standard input and returns the equivalent
 * double as precisely as possible; if text does not represent a
 * double, user is prompted to retry.  Leading and trailing whitespace
 * is ignored.  For simplicity, overflow and underflow are not detected.
 * If line can't be read, returns DBL_MAX.
 */

double 
GetDouble(void);


/*
 * Reads a line of text from standard input and returns the equivalent
 * float as precisely as possible; if text does not represent a float,
 * user is prompted to retry.  Leading and trailing whitespace is ignored.
 * For simplicity, overflow and underflow are not detected.  If line can't
 * be read, returns FLT_MAX.
 */

float 
GetFloat(void);


/*
 * Reads a line of text from standard input and returns it as an
 * int in the range of [-2^31 + 1, 2^31 - 2], if possible; if text
 * does not represent such an int, user is prompted to retry.  Leading
 * and trailing whitespace is ignored.  For simplicity, overflow is not
 * detected.  If line can't be read, returns INT_MAX.
 */

int 
GetInt(void);


/*
 * Reads a line of text from standard input and returns an equivalent
 * long long in the range [-2^63 + 1, 2^63 - 2], if possible; if text
 * does not represent such a long long, user is prompted to retry.
 * Leading and trailing whitespace is ignored.  For simplicity, overflow
 * is not detected.  If line can't be read, returns LLONG_MAX.
 */

long long 
GetLongLong(void);


/*
 * Reads a line of text from standard input and returns it as a string,
 * sans trailing newline character.  (Ergo, if user inputs only "\n", 
 * returns "" not NULL.)  Leading and trailing whitespace is not ignored.
 * Returns NULL upon error or no input whatsoever (i.e., just EOF).
 */

string GetString(void);



#endif