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islower, iswlower, _ismbclower

Header File

ctype.h, mbstring.h

Category

Classification Routines

Prototype

int islower(int c);

int iswlower(wint_t c);

int _ismbclower(unsigned int c);

Description

Tests for lowercase character.

islower is a macro that classifies ASCII-coded integer values by table lookup. The macro is affected by the current locale’s LC_CTYPE category. For the default C locale, c is a lowercase letter (a to z).

You can make this macro available as a function by undefining (#undef) it.

Return Value

islower returns nonzero if c is a lowercase letter.

Example

Copy Code

    #include <stdio.h>
    #include <ctype.h>
    int main(void)
    {
      char c = 'C';
      if (islower(c))
        printf("%c is a lowercase character\n",c);
      else
        printf("%c is not a lowercase character\n",c);
      return 0;
    }

Portability

| POSIX | Win32 | ANSI C | ANSI C++
islower | + | + | + | +
_ismbclower |  | + |  |
iswlower |  | + | + | +

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