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#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include "_assert.h"
/** test whether a character is a digit **/
int isdigit(int c)
{
ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF);
return isxdigit(c) && !isalpha(c);
}
/***
tests whether ARGUMENT(c) is a character in the class CHARACTER_CLASS(digit)
in the current locale.
***/
/*
RETURN(NONZERO, ARGUMENT(c) is a digit)
RETURN(0, ARGUMENT(c) is not a digit)
LC_CTYPE
C_LOCALE(`THIS() is true for characters CHAR(0), CHAR(1), CHAR(2), CHAR(3), CHAR(4), CHAR(5), CHAR(6), CHAR(7), CHAR(8), and CHAR(9)')
STDC(1)
*/
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