C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
Case Conversion Routines
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <ctype.h>
 
  Syntax:    int __toascii( int c );
             int tolower( int c );
             int _tolower( int c );
             int toupper( int c );
             int _toupper( int c );
 
  Returns:   (__toascii)  the ASCII value of <c>.
             (tolower)    the lowercase equivalent of <c>.
             (_tolower)   the lowercase equivalent of <c>, only
                          if <c> is an uppercase letter.
             (toupper)    the uppercase equivalent of <c>.
             (_toupper)   the uppercase equivalent of <c>, only
                          if <c> is a lowercase letter.
 
  See also:  _strupr, _strlwr, \ais...
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