islower(3)                          CLIX                          islower(3)



  NAME

    islower - Tests whether a character is lowercase

  LIBRARY

    Standard C Library (libc.a)

  SYNOPSIS

    #include <ctype.h>

    int islower(
      int c );

  PARAMETERS

    c   An integer representing a character

  DESCRIPTION

    The islower() macro tests for any lowercase letter as defined by the
    character set.  The islower() macro is defined on valid members of the
    character set and on the single value EOF (guaranteed not to be a
    character set member.  See stdio.

    The classification macro islower() does a table lookup.

  EXAMPLES

    To test if the character read from stdin is lowercase:

    #include <ctype.h>
    int c;
       .
       .
       .
    /* get a character from stdin */
    printf("enter a character:");
    c = getchar();

    /* check to see if a digit was read */
    if (islower(c))
    {
         printf("read a lowercase"\n);
    }


  CAUTIONS

    If the argument to any character handling macro is not in the domain of



  2/94 - Intergraph Corporation                                              1

  islower(3)                          CLIX                          islower(3)



    the function, the result is undefined.

  RETURN VALUES

    The islower() macro returns 0 for false and nonzero numbers for true.

  RELATED INFORMATION

    Commands:  chrtbl(1)

    Functions:  isdigit(3), isxdigit(3), isupper(3), isalpha(3), isalnum(3),
    isspace(3), iscntrl(3), ispunct(3), isprint(3), isgraph(3), isascii(3),
    tolower(3), toupper(3), toascci(3), _tolower(3), _toupper(3),
    setchrclass(3)

    Files:  stdio(3)

    Miscellany:  environ(4)




































  2                                              Intergraph Corporation - 2/94