int isalnum(int __c)int isalpha(int __c)int isascii(int __c)int isblank(int __c)int iscntrl(int __c)int isdigit(int __c)int isgraph(int __c)int islower(int __c)int isprint(int __c)int ispunct(int __c)int isspace(int __c)int isupper(int __c)int isxdigit(int __c)