islower, iswlower, _islower_l, _iswlower_l

Determines whether an integer represents a lowercase character.

int islower(
   int c 
);
int iswlower(
   wint_t c 
);
int islower_l(
   int c,
   _locale_t locale
);
int _iswlower_l(
   wint_t c,
   _locale_t locale
);

Parameters

• c
  Integer to test.

• locale
  Locale to use.

Return Value

Each of these routines returns nonzero if c is a particular representation of a lowercase character. islower returns a nonzero value if c is a lowercase character (a – z). iswlower returns a nonzero value if c is a wide character that corresponds to a lowercase letter, or if c is one of an implementation-defined set of wide characters for which none of iswcntrl, iswdigit, iswpunct, or iswspace is nonzero. Each of these routines returns 0 if c does not satisfy the test condition.

The versions of these functions that have the _l suffix use the locale that's passed in instead of the current locale for their locale-dependent behavior. For more information, see Locale.

The behavior of islower and _islower_l is undefined if c is not EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c is not one of these values, the functions raise an assertion.

Generic-Text Routine Mappings

Requirements

For additional compatibility information, see Compatibility.

.NET Framework Equivalent

System::Char::IsLower

See Also

Reference

Character Classification

Locale

is, isw Routines