check the given string is numeric or not. Post: 302121938

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Check whether input is numeric

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isalnum

ISALNUM(3)						   BSD Library Functions Manual 						ISALNUM(3)

NAME

     isalnum -- alphanumeric character test

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <ctype.h>

     int
     isalnum(int c);

DESCRIPTION

     The isalnum() function tests for any character for which isalpha(3) or isdigit(3) is true.

RETURN VALUES

     The isalnum() function returns zero if the character tests false and returns non-zero if the character tests true.

SEE ALSO

     ctype(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3),
     isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

STANDARDS

     The isalnum() function conforms to ANSI X3.159-1989 (``ANSI C89'').

CAVEATS

     The argument to isalnum() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined.	See the CAVEATS section of
     ctype(3) for more details.

BSD
								  April 17, 2008							       BSD