islower(3)                                                   islower(3)

  islower()

  NAME

    islower() - lower-case character test

  SYNOPSIS

    #include 

    int islower (int c)

  DESCRIPTION

    The islower(3) function tests whether c is a character of class lower in
    the program's current locale.

    In the POSIX locale, the character class lower includes the following
    characters:
    "a"     "b"     "c"     "d"     "e"

    "f"     "g"     "h"     "i"     "j"

    "k"     "l"     "m"     "n"     "o"

    "p"     "q"     "r"     "s"     "t"

    "u"     "v"     "w"     "x"     "y"

    "z"

  RETURN VALUES

    The islower(3) function returns zero if the character tests false and
    returns non-zero if the character tests true.

  SEE ALSO

    isalnum(3)

    isalpha(3)

    isblank(3)

    iscntrl(3)

    isdigit(3)

    isgraph(3)

    isprint(3)

    ispunct(3)

    isspace(3)

    isupper(3)

    isxdigit(3)

    tolower(3)

    toupper(3)

  USAGE NOTES

    The islower function is thread safe.

    The islower function is not async-signal safe.