Description: Character test function isalnum (test whether the characters in English letters or numbers) isalpha (test whether the letters of the alphabet characters) isascii (test characters are characters in ASCII code) isblank (test characters for space characters) iscntrl (test whether the ASCII characters control character code) isdigit (test characters for Arabic numerals) isgraph (test characters are printable characters) islower (test characters are lowercase letters of the alphabet) isprint (test characters are printable characters) isspace (test whether the characters space character) ispunct (test characters for punctuation or special symbols) isupper (test characters are capitalized letters of the alphabet) isxdigit (test whether the 16 hexadecimal characters figures)
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