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dpmax_c

 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

```   dpmax_c ( Largest DP number )

SpiceDouble dpmax_c ()

```

#### Abstract

```   Return the value of the largest (positive) number representable
in a double precision variable.
```

```   None.
```

#### Keywords

```   CONSTANTS

```

#### Brief_I/O

```   The function returns the value of the largest (positive) number
that can be represented in a double precision variable.
```

#### Detailed_Input

```   None.
```

#### Detailed_Output

```   The function returns the value of the largest (positive) number
that can be represented in a double precision variable.

This value varies from machine to machine. The value is defined by
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
```

#### 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 dpmax_c.
Note in the second example that the smallest negative number
is not necessarily the negative of the largest positive number.

1) Set a range variable for a star or ephemeris object.

/.
Compute the distance to each object. For stars, use
a "very large" distance.
./

for ( i = 0;  i < n;  i++ )
{
if (  strcmp ( type[i], "star" )  )
{
/.
The object is not a star.
./

range[i] = vnorm_c ( state[i] );
}
else
{
range[i] = sqrt ( dpmax_c() ) / 2.;
}
}

2) 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)
J. Diaz del Rio     (ODC Space)
H.A. Neilan         (JPL)
M.J. Spencer        (JPL)
W.L. Taber          (JPL)
I.M. Underwood      (JPL)
```

#### Version

```   -CSPICE Version 1.1.1, 02-JUN-2021 (JDR)

Edited the header to comply with NAIF standard.

-CSPICE Version 1.1.0, 23-JUL-2001 (NJB)

Removed tab characters from source file.

-CSPICE Version 1.0.0, 16-OCT-1998 (NJB) (HAN) (MJS) (WLT) (IMU)
```

#### Index_Entries

```   largest d.p. number
```
`Fri Dec 31 18:41:04 2021`