cspice_hx2dp

 Abstract I/O Examples Particulars Required Reading Version Index_Entries
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```

#### Abstract

```
CSPICE_HX2DP converts a string representing a double precision number in a
base 16 ``scientific notation'' into its equivalent double precision number.

For important details concerning this module's function, please refer to
the CSPICE routine hx2dp_c.

```

#### I/O

```
Given:

string   a character string containing a base 16 ``scientific
notation'' representation of a double precision number
which is to be converted to a double precision number,
e.g.:

'2A^3' = ( 2/16 + 10/( 16**2 ) ) * 16**3 = 672.0

and

'-B^1' = - ( 11/16 ) * 16**1             = -11.0

The following table describes the character set used to
represent the hexadecimal digits and their corresponding
values.

Character     Value         Character     Value
---------    -------        ---------    -------
'0'         0.0D0           '8'         8.0D0
'1'         1.0D0           '9'         9.0D0
'2'         2.0D0         'A','a'      10.0D0
'3'         3.0D0         'B','b'      11.0D0
'4'         4.0D0         'C','c'      12.0D0
'5'         5.0D0         'D','d'      13.0D0
'6'         6.0D0         'E','e'      14.0D0
'7'         7.0D0         'F','f'      15.0D0

The caret, or hat, character, '^', is used to
distinguish the exponent.

The plus sign, '+', and the minus sign, '-', are used,
and they have their usual meanings.

A base 16 ``scientific notation'' character string which
is to be parsed by this routine should consist of a sign,
'+' or '-' (the plus sign is optional for nonnegative
numbers), followed immediately by a contiguous sequence
of hexadecimal digits, the exponent character, and a
signed hexadecimal exponent. The exponent is required,
but the sign is optional for a nonnegative exponent.

A number in base 16 ``scientific notation'' consists of
a contiguous sequence of characters with one of the
following formats:

(1)   h h h h  ... h ^H H  ... H
1 2 3 4      n  1 2      m

(2)   +h h h h  ... h ^H H  ... H
1 2 3 4      n  1 2      m

(3)   -h h h h  ... h ^H H  ... H
1 2 3 4      n  1 2      m

(4)    h h h h  ... h ^+H H  ... H
1 2 3 4      n   1 2      m

(5)   +h h h h  ... h ^+H H  ... H
1 2 3 4      n   1 2      m

(6)   -h h h h  ... h ^+H H  ... H
1 2 3 4      n   1 2      m

(7)   h h h h  ... h ^-H H  ... H
1 2 3 4      n   1 2      m

(8)   +h h h h  ... h ^-H H  ... H
1 2 3 4      n   1 2      m

(9)   -h h h h  ... h ^-H H  ... H
1 2 3 4      n   1 2      m

where

h  and H  denote hexadecimal digits;
i      j

'^'         denotes exponentiation;

and

+ and - have their usual interpretations.

'string' may have leading and trailing blanks, but blanks
embedded within the significant portion of the input
string are not allowed.

the call:

cspice_hx2dp, string, number, error errmsg

returns:

number   the scalar double precision number corresponding to 'string'.
The value of this argument is not changed if an error occurs
while parsing the input string.

error    a scalar logical flag which indicates whether an error
occurred while attempting to parse 'number' from the input
character string 'string'. 'error' will have the value
true if an error occurs. It will have the value
false otherwise.

errmsg   a scalar string containing a descriptive error message if
an error occurs while attempting to parse the number
'number' from the hexadecimal character string 'string',
blank otherwise.

```

#### Examples

```
Any numerical results shown for this example may differ between
platforms as the results depend on the SPICE kernels used as input
and the machine specific arithmetic implementation.

The following input and output argument values illustrate the
action of cspice_hx2dp for various input values of 'string'.

Note: The hat or caret, '^', signals an exponent.

string                  number         error   errmsg
----------------------  -------------  ------  ------
89705F4136B4A8^-7            2.0D-9   false   " "
1^1                          1.0D0    false   " "
-1^1                         -1.0D0    false   " "
4^3                       1024.0D0    false   " "
-4^3                      -1024.0D0    false   " "
7F5EB^5                 521707.0D0    false   " "
7F5eb^5                 521707.0D0    false   " "
7f5eb^5                 521707.0D0    false   " "
1B^2                        27.0D0    false   " "
+1B^2                        27.0D0    false   " "
+1B^+2                       27.0D0    false   " "
0^0                          0.0D0    false   " "

```

#### Particulars

```
This routine will convert a character string containing a number
in base 16 ``scientific notation'' into its equivalent double
precision number.

This routine is one of a pair of routines which are used to
perform conversions between double precision numbers and
an equivalent base 16 ``scientific notation'' character string
representation:

cspice_dp2hx -- Convert a double precision number into a base 16
``scientific notation'' character string.

cspice_hx2dp -- Convert a base 16 ``scientific notation''
character string into a double precision number.

```

```
ICY.REQ

```

#### Version

```
-Icy Version 1.0.0, 29-APR-2009 (EDW)

```

#### Index_Entries

```
convert signed normalized hexadecimal string to d.p.
convert encoded d.p. number to d.p. number
convert base 16 scientific notation d.p. number

```
`Wed Apr  5 17:58:01 2017`