Difference between revisions of "Constants and Expressions"
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==Constants== | ==Constants== | ||
| − | + | Recital supports the following constants: | |
| + | |||
{| class="wikitable" | {| class="wikitable" | ||
!Datatype||Description | !Datatype||Description | ||
|- | |- | ||
| − | |Character||A string of ASCII characters up to | + | |Character||A string of ASCII characters up to 65535 characters in length. Delimited by double quotes "", single quotes ‘’ or square brackets [] |
| − | Delimited by double quotes "", single quotes | + | |
|- | |- | ||
|Numeric||An integer number of up to 16 digits (0-9) or a floating point number of up to 25 digits (9 are reserved for decimal places) and one decimal point. | |Numeric||An integer number of up to 16 digits (0-9) or a floating point number of up to 25 digits (9 are reserved for decimal places) and one decimal point. | ||
| Line 12: | Line 12: | ||
|Date||A combination of digits and separators delimited by curly braces {}. The format is determined by the SET DATE and SET CENTURY commands. | |Date||A combination of digits and separators delimited by curly braces {}. The format is determined by the SET DATE and SET CENTURY commands. | ||
|- | |- | ||
| − | |Logical||A choice of two values, .T. for true, .F. for false | + | |Logical||A choice of two values, .T. for true, .F. for false (true and false can also be used themselves) |
|- | |- | ||
|} | |} | ||
| + | |||
====Hexadecimal numbers==== | ====Hexadecimal numbers==== | ||
Hexadecimal numbers, prefixed by 0x, can be used in place of decimal numbers except in the data entry/modification of numerics. (Linux platforms only). | Hexadecimal numbers, prefixed by 0x, can be used in place of decimal numbers except in the data entry/modification of numerics. (Linux platforms only). | ||
| + | |||
<code lang="recital"> | <code lang="recital"> | ||
? BITAND(0x67452301,0xFFFFFFFF) | ? BITAND(0x67452301,0xFFFFFFFF) | ||
</code> | </code> | ||
| + | |||
Results of expressions will still be returned as decimal numbers. | Results of expressions will still be returned as decimal numbers. | ||
| + | |||
<code lang="recital"> | <code lang="recital"> | ||
| Line 30: | Line 34: | ||
</code> | </code> | ||
| − | The TRANSFORM() function can be used to return a numeric as a hexadecimal. | + | |
| + | The [[TRANSFORM()]] function can be used to return a numeric as a hexadecimal. | ||
| + | |||
<code lang="recital"> | <code lang="recital"> | ||
| Line 39: | Line 45: | ||
==Expressions== | ==Expressions== | ||
| − | The TYPE() function can be used to determine the data type of any expression. | + | The [[TYPE()]] function can be used to determine the data type of any expression. |
| + | |||
{| class="wikitable" | {| class="wikitable" | ||
| Line 75: | Line 82: | ||
|- | |- | ||
|} | |} | ||
| + | |||
[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Reference]] | [[Category:Reference]] | ||
Latest revision as of 11:25, 3 September 2010
Constants
Recital supports the following constants:
| Datatype | Description |
|---|---|
| Character | A string of ASCII characters up to 65535 characters in length. Delimited by double quotes "", single quotes ‘’ or square brackets [] |
| Numeric | An integer number of up to 16 digits (0-9) or a floating point number of up to 25 digits (9 are reserved for decimal places) and one decimal point. |
| Date | A combination of digits and separators delimited by curly braces {}. The format is determined by the SET DATE and SET CENTURY commands. |
| Logical | A choice of two values, .T. for true, .F. for false (true and false can also be used themselves) |
Hexadecimal numbers
Hexadecimal numbers, prefixed by 0x, can be used in place of decimal numbers except in the data entry/modification of numerics. (Linux platforms only).
? BITAND(0x67452301,0xFFFFFFFF)
Results of expressions will still be returned as decimal numbers.
? 0x1a * 2 52
The TRANSFORM() function can be used to return a numeric as a hexadecimal.
? transform((0x1a * 2),"@0") 0x00000034
Expressions
The TYPE() function can be used to determine the data type of any expression.
| uMemvar | TYPE("uMemvar") | Type |
|---|---|---|
| [hello] | ’C’ | Character |
| ’goodbye’ | ’C’ | Character |
| "RECITAL" | ’C’ | Character |
| 1234 | ’N’ | Numeric |
| 1234.56 | ’N’ | Numeric |
| "1234.56" | ’C’ | Character |
| 0x2b | ’N’ | Numeric |
| {01/01/96} | ’D’ | Date |
| {01/01/1996} | ’D’ | Date |
| "01/01/96" | ’C’ | Character |
| .T. | ’L’ | Logical |
| .F. | ’L’ | Logical |
| opentags | ’P’ | Procedure |
| OMyObj | ’O’ | Object |
| Undetermined Type | ’U’ | Undefined |
