C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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Character-Classification Functions
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─────Run-Time Library───────────────────────────────────────────────────────
 
   The following functions identify the type of a character or convert
   between types:
 
   isalnum     iscntrl      ispunct       tolower
   isalpha     isdigit      isspace      _tolower
 __isascii     isgraph      isupper       toupper
  _iscsym      islower      isxdigit     _toupper
  _iscsymf     isprint    __toascii
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