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7.4.6 Character classification functions

Character classification functions are as follows.

Table 7.8

Character Classification Functions

Function/Macro Name

Outline

isalnum

Identification of ASCII letter or numeral

isalpha

Identification of ASCII letter

isascii

Identification of ASCII code

isupper

Identification of upper-case character

islower

Identification of lower-case character

isdigit

Identification of decimal number

isxdigit

Identification of hexadecimal number

iscntrl

Identification of control character

ispunct

Identification of delimiter character

isspace

Identification of space/tab/carriage return/line feed/vertical tab/page feed

isprint

Identification of display character

isgraph

Identification of display character other than space