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
);
Parameters
[in] c
Character to convert.[in] locale
Locale to use for locale-specific translation.
Return Value
Each of these routines converts a copy of c to lower case if the conversion is possible, and returns the result. There is no return value reserved to indicate an error.
Remarks
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.
In order for _tolower to give the expected results, __isascii and isupper must both return nonzero.
Generic-Text Routine Mappings
TCHAR.H routine |
_UNICODE & _MBCS not defined |
_MBCS defined |
_UNICODE defined |
|---|---|---|---|
_totlower |
tolower |
_mbctolower |
towlower |
_totlower_l |
_tolower_l |
_mbctolower_l |
_towlower_l |
备注
_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.
Requirements
Routine |
Required header |
|---|---|
tolower |
<ctype.h> |
_tolower |
<ctype.h> |
towlower |
<ctype.h> or <wchar.h> |
For additional compatibility information, see Compatibility in the Introduction.
Example
See the example in to Functions.