tolower, _tolower, towlower, _tolower_l, _towlower_l
Converts a character to lowercase.
int tolower( int c ); int _tolower( int c ); int towlower( wint_t c ); int _tolower_l( int c, _locale_t locale ); int _towlower_l( wint_t c, _locale_t locale );
Each of these routines converts a given uppercase letter to a lowercase letter if it is possible and relevant. The case conversion of towlower is locale-specific. Only the characters relevant to the current locale are changed in case. The functions without the _l suffix use the currently set locale. The versions of these functions that have the _l suffix take the locale as a parameter and use that instead of the currently set locale. For more information, see Locale.
_UNICODE & _MBCS not defined
_tolower_l and _towlower_l have no locale dependence and are not meant to be called directly. They are provided for internal use by _totlower_l.
<ctype.h> or <wchar.h>
For additional compatibility information, see Compatibility in the Introduction.