====== 3.6 Constants ======
[[dido:public:s_cli:05_contents:01_prt:02_basics:start| Return to DIDO CLI Background]]

===== ALGORITHM =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]

The name of the default algorithm used for [[dido:public:ra:xapend:xapend.a_glossary:e:encryption|encryption]].

<code>
DEFINE CONSTANT DEFAULT_ALGORITHM AS “SHA-256”;
</code>

===== BASE_FORMAT =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]

The name of the default binary formats (i.e., width in bits) for hash and crypto keys.

<code>
BINARY_FORMAT ::= "Base64";
</code>


===== BINARY_FORMAT =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]
A string that can be used to designate a binary format.

<code>
BINARY_FORMAT ::= "Binary";
</code>

===== DATE_FORMAT_STRING =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]

The default string for formatting dates. 
  * YYYY - Four digit year (i.e., 2021)
  * MM - Two digits representing for the month (i.e, 1->January, 12->December)
  * DD - Two digits representing the day within the month (i.e., the first of january 2021 would be 2021-01-01)
  * HH - Two digits representing the 24 hour day (i.e., 1 is 1 AM, 13 represents 1 PM).
  * MM - Two digits representing the minute within the hour.
  * SS - Two digits representing the second within the minute.

<code>
DATE_FORMAT_STRING ::= "YYYY-MM-DD HH:MM:SS";
</code>


===== FALSE =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]
The numeric constant representing the Boolean False.

<code>
FALSE ::= 0;
</code>

===== HEX_FORMAT =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]
A string that can be used to designate a hexadecimal format.

<code>
HEX_FORMAT ::= "Hex";
</code>

===== MAXIMUM_NAME_LENGTH =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]
The maximum length in characters of an object name.

<code>
MAXIMUM_NAME_LENGTH ::= 30;
</code>

===== NULL =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]

<code>
NULL ::= NULL;
</code>

===== TRUE =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]
The numeric constant representing the Boolean TRUE.

<code>
TRUE ::= 1;
</code>

===== VOID =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]

<code>
VOID ::= {};
</code>


===== WHITESPACE =====
[[dido:public:s_cli:05_contents:01_prt:03_langconst:06_constants:start| Return to Top]]
The list of characters that represent a whitespace character.
  * ' ' -  A blank character
  * '\t' - A tab character
  * '\r' - A carriage return character
  * '\n' - A newline character
  * '\f' - A form feed character
 
<code>
WHITESPACE ::= [ \t\r\n\f];
</code>

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