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Synopsis:
    #include <ctype.h>
    int isspace( int c );
    #include <wchar.h>
    int iswspace( wint_t c );

Description:
    The isspace function tests for the following white-space characters:

    Constant     Character

' '
    space

'\f'
    form feed

'\n'
    new-line or linefeed

'\r'
    carriage return

'\t'
    horizontal tab

'\v'
    vertical tab

    The iswspace function is similar to isspace except that it accepts a
    wide-character argument.

Returns:
    The isspace function returns a non-zero character when the argument is
    one of the indicated white-space characters.  The iswspace function
    returns a non-zero value when the argument is a wide character that
    corresponds to a standard white-space character or is one of an
    implementation-defined set of wide characters for which  iswalnum is
    false.  Otherwise, zero is returned.

Example:
    #include <stdio.h>
    #include <ctype.h>

    char chars[] = {
        'A',
        0x09,
        ' ',
        0x7d
    };

    #define SIZE sizeof( chars ) / sizeof( char )

    void main()
      {
        int   i;

        for( i = 0; i < SIZE; i++ ) {
          printf( "Char %c is %sa space character\n",
                chars[i],
                ( isspace( chars[i] ) ) ? "" : "not " );
        }
      }

    produces the following:

    Char A is not a space character
    Char     is a space character
    Char   is a space character
    Char } is not a space character

Classification:
    isspace is ANSI, iswspace is ANSI

Systems:
     isspace - All, Netware

    iswspace - All, Netware

See Also:
    isalnum, isalpha, iscntrl, isdigit, isgraph, isleadbyte, islower,
    isprint, ispunct, isupper, iswctype, isxdigit, tolower, toupper