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dpmin_c
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Procedure
Abstract
Required_Reading
Keywords
Brief_I/O
Detailed_Input
Detailed_Output
Parameters
Exceptions
Files
Particulars
Examples
Restrictions
Literature_References
Author_and_Institution
Version
Index_Entries

Procedure

   SpiceDouble dpmin_c () 

Abstract

 
   Return the value of the smallest (negative) number representable 
   in a double precision variable. 
 

Required_Reading

 
   None. 
 

Keywords

 
   CONSTANTS 
 

Brief_I/O

 
   The function returns the value of the smallest (negative) number 
   that can be represented in a double precision variable. 
 

Detailed_Input

 
   None. 
 

Detailed_Output

 
   The function returns the value of the smallest (negative) number 
   that can be represented in a double precision variable. 
 
   This value varies from machine to machine.  Usually, the value is 
   defined as the negative of the macro DBL_MAX from the ANSI standard
   header file float.h.  According to the ANSI standard, DBL_MAX must be 
   at least
   
      1.E+37 
      
   Therefore dpmin_c usually returns a value less than or equal to 

     -1.E+37
        
   Exceptional systems would be those where DBL_MAX cannot be negated.
   Currently no such systems are supported.      
 

Parameters

 
   None. 
 

Exceptions

 
   Error free. 
 

Files

 
   None. 
 

Particulars

 
   The function always returns a constant value, set by the user 
   prior to compilation. 
 

Examples

 
   The following code fragments illustrate the use of dpmin_c. 
   Note in the example that the smallest negative number is not assumed
   to be the negative of the largest positive number. 
 
   1) Initialize a CSPICE "window."
   
      /.
      The window originally has one interval, from "minus 
      infinity" to "plus infinity". 
      ./
      
      winsiz    =  2;
      window[0] =  dpmin_c();
      window[1] =  dpmax_c() ;

      scardd_ ( &winsiz, window ); 
      
 

Restrictions

 
   None. 
 

Literature_References

 
   None.
    

Author_and_Institution

 
   N.J. Bachman    (JPL) 
   H.A. Neilan     (JPL) 
   M.J. Spencer    (JPL) 
   W.L. Taber      (JPL) 
   I.M. Underwood  (JPL) 
 

Version

 
   -CSPICE Version 1.0.0, 19-OCT-1998 (NJB)

Index_Entries

 
   smallest d.p. number 
 
Wed Apr  5 17:54:31 2017