Procedure

   SpiceDouble brcktd_c ( SpiceDouble  number, 
                          SpiceDouble  end1,
                          SpiceDouble  end2   )

Abstract

 
   Bracket a number. That is, given a number and an acceptable 
   interval, make sure that the number is contained in the 
   interval. (If the number is already in the interval, leave it 
    alone. If not, set it to the nearest endpoint of the interval.) 
 

Required_Reading

 
   None. 
 

Keywords

   None.
    

Brief_I/O

   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   number     I   Number to be bracketed. 
   end1       I   One of the bracketing endpoints for number. 
   end2       I   The other bracketing endpoint for number. 
  
   The function returns the bracketed number.    
 

Detailed_Input

   number      is the number to be bracketed. That is, the 
               value of number is constrained to lie in the 
               interval bounded by end1 and end2. 

   end1, 
   end2        are the lower and upper bounds for number. The 
               order is not important. 
 

Detailed_Output

 
   The function returnes the input number, if it was already in the 
   interval provided. Otherwise the returned value is the nearest 
   bound of the interval. 
 

Parameters

 
   None. 
 

Exceptions

 
   Error free. 
 

Files

 
   None. 
 

Particulars

 
   This routine provides a shorthand notation for code fragments 
   like the following 

      #include "SpiceUsr.h"
            .
            .
            .
      if ( number < end 1 )
      {
         number = end1;
      }
      else if ( number > end2 )
      {
         number = end2;
      }
      

   which occur frequently during the processing of program inputs. 
 

Examples

 
    The following illustrates the operation of brcktd_c. 
 
          brcktd_c (  -1.,   1.,  10. )  =  1. 
          brcktd_c (  29.,   1.,  10. )  = 10. 
          brcktd_c (   3., -10.,  10. )  =  3. 
          brcktd_c (   3., -10.,  -1. )  = -1. 
 
    The following code fragment illustrates a typical use for brcktd_c. 
 
       #include "SpiceUsr.h"
            .
            .
            .
       /.
       Star magnitude limit must be in the range 0-10. 
       ./    
       
       prompt_c ( "Enter magnitude limit > ", 25, magLimStr );
       
       prsdp_c  ( magLimStr, &maglim );
       
       maglim = brcktd_c ( maglim, 0., 10. );
       

Restrictions

 
   None. 
 

Literature_References

 
   None. 
 

Author_and_Institution

 
   N.J. Bachman    (JPL)
   W.L. Taber      (JPL) 
   I.M. Underwood  (JPL) 
 

Version

   -CSPICE Version 1.0.1, 11-NOV-2006 (EDW)

      Added "None." text to Keywords section, required for
      API doc script (cspicehtml.pl) integrity checks.
 
   -CSPICE Version 1.0.0, 16-AUG-1999 (NJB) (WLT) (IMU)

Index_Entries

 
   bracket a d.p. value within an interval 
 

Link to routine brcktd_c source file brcktd_c.c