The io_fortran_lib module provides access to a handful of
parameter constants
for general use:
NL: The newline character (system agnostic).SPACE: The space character.CR: The carriage return character.FF: The form feed character.VT: The vertical tab character.LF: The line feed character.TAB: The horizontal tab character.HT: The horizontal tab character (alternate name).BELL: The bell/alert character.NUL: The null character.CNUL: The C null character re-exported from iso_c_binding.