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  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> only
                       if <c> is an uppercase letter.
             (_tolower) the lowercase equivalent of <c>.
             (toupper) the uppercase equivalent of <c> only
                       if <c> is a lowercase letter.
             (_toupper) the uppercase equivalent of <c>.
 
  See also:  \ais...
                                    -♦-