| title | Character Classification | Microsoft Docs | |||||||||||||
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| ms.date | 11/04/2016 | |||||||||||||
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| ms.topic | article | |||||||||||||
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| ms.assetid | 3b6c8f0b-9701-407a-b384-9086698773f5 | |||||||||||||
| caps.latest.revision | 12 | |||||||||||||
| author | corob-msft | |||||||||||||
| ms.author | corob | |||||||||||||
| manager | ghogen | |||||||||||||
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Each of these routines tests a specified single-byte character, wide character, or multibyte character for satisfaction of a condition. (By definition, the ASCII character set between 0 and 127 are a subset of all multibyte-character sets. For example, Japanese katakana includes ASCII as well as non-ASCII characters.)
The test conditions are affected by the setting of the LC_CTYPE category setting of the locale; see setlocale for more information. The versions of these functions without the _l suffix use the current locale for this locale-dependent behavior; the versions with the _l suffix are identical except that they use the locale parameter passed in instead.
Generally these routines execute faster than tests you might write and should be favored over. For example, the following code executes slower than a call to isalpha(c):
if ((c >= 'A') && (c <= 'Z')) || ((c >= 'a') && (c <= 'z'))
return TRUE;