iscsym -- Test for Valid C Identifier Symbol

SYNOPSIS
#include <lctype.h>
int iscsym(int c);
DESCRIPTION
iscsym
tests an integer value to determine whether it is a
character that can appear in a C identifier (after the first
character). This implementation includes the uppercase and lowercase
alphabetic characters, the digits, and the underscore as valid
characters.
RETURN VALUE
iscsym
returns 0 if the character is not a valid character in a C
identifier, or a nonzero value if it is. If the argument is EOF
, 0
is returned.
CAUTION
The effect of iscsym
on a noncharacter argument other than EOF
is undefined. Do not assume that iscsym
returns either 0 or 1.
EXAMPLE
See iscsymf
for an example of this function.
RELATED FUNCTIONS
iscsymf
SEE ALSO