DaWei

isalnum
Tests whether an element in a locale is an alphabetic or a numeric character.

isalpha
Tests whether an element in a locale is alphabetic character.

iscntrl
Tests whether an element in a locale is a control character.

isdigit
Tests whether an element in a locale is a numeric character.

isgraph
Tests whether an element in a locale is an alphanumeric or punctuation character.

islower
Tests whether an element in a locale is lower case.

isprint
Tests whether an element in a locale is a printable character.

ispunct
Tests whether an element in a locale is a punctuation character.

isspace
Tests whether an element in a locale is a whitespace character.

isupper
Tests whether an element in a locale is upper case.

isxdigit
Tests whether an element in a locale is a character used to represent a hexadecimal number.

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Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code.
Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers