Index

NAME

const.h - header for constants

INCLUDE

include "const.h"

KEYWORDS

constants, DUMMY, INFINITY

DESCRIPTION

The  header  file  const.h contains several const values for fre­
quent use in C++ programs.

DUMMY - real variable that can be recognized, it equals -99999.0,
but  this  value  has  no  meaning.  The  value  is  chosen to be
"unlikely" so that the DUMMY value can be recognized from  a  set
of real numbers.

ZERO - real variable that equals 0.

INFINITY  -  real  variable  for indicating inifinity. Its actual
numerical value is .

UNITY - real value that equals 1.


Some system header files may declare macros with the  same  name.
These macros will then take precedence.

EXAMPLES

|    Interval  I(-INFINITY,ZERO);   // interval from -infinity to
zero

  if (t == DUMMY) // t has no meaning
    // ....

  return true; // bool return value

DEVELOPED BY

SINTEF Applied Mathematics, Oslo, Norway, and University of Oslo,
Dept. of Mathematics, Norway

AUTHOR

Hans Petter Langtangen, SINTEF/UiO