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Difference between revisions of "Declaring data"

(Values of simple value types)
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<br>
 
  
EGL native types are in three categories:
 
 
:[[Declaring data#Values_of_simple_value_types|Simple value types]]:
 
 
::BigInt, Bytes(''n''), Date, Decimal(''n''), Decimal(''n'', ''p''),
 
 
::Float, Int, SmallFloat, SmallInt, Timestamp(''pattern'')
 
 
:[[Declaring data#Values_of_simple_reference_types|Simple reference types]]:
 
 
::Bytes, Decimal, Number, String (now a value type),
 
 
::String(''n''), Timestamp (now a value type)
 
 
:[[Declaring data#Values_of_other_reference_types|Other reference types]]:
 
 
::Any, Dictionary, List
 
 
<br>Your custom types are based on these EGL classifiers:
 
 
:Delegate, Enumeration, ExternalType, Handler,
 
:Interface, Library, Program, Record, Service
 
 
<br>
 
 
= <br> '''Values of simple value types'''  =
 
 
<source lang="java">
 
/** Character value types. **/
 
/** Note: String without parameter will be a reference type in EDT 1.0. **/
 
 
// defaults to "".
 
firstName String;
 
 
// defaults to null.         
 
secondName String?;
 
 
// initializes value to "John" and allows a future value to be null.       
 
thirdName String? = "John"; 
 
 
// initializes the value, which is unchangeable.
 
const LANGUAGE String = "EGL";       
 
 
 
 
/** Numeric value types. **/
 
 
// defaults to 0.
 
someVal Int;               
 
 
// defaults to null.
 
otherVal SmallInt?;     
 
 
// defaults to 0.0.
 
coord Float;     
 
 
// defaults to 000.00.
 
// can hold 5 digits total, with 2 after the decimal point.           
 
amount Decimal(5,2);       
 
 
 
 
 
/** Date-and-time value types. **/
 
 
// defaults to today's date.
 
today Date;   
 
 
// defaults to now. the second declaration uses the default pattern.
 
now TIMESTAMP("ddHHmmssffffff");
 
later TIMESTAMP("yyyyMMddHHmmss");
 
 
 
 
 
/** Boolean type **/
 
 
// defaults to false       
 
toggle Boolean;           
 
</source>
 
 
= Values of simple reference types  =
 
 
<br>
 
 
<br>
 
 
= Values of other reference types  =
 
 
== Values of type Any  ==
 
 
<source lang="java">
 
 
 
</source>
 
 
== Values of type Dictionary  ==
 
 
<source lang="java">
 
 
 
</source>
 
 
<br>
 
 
<br>
 
 
== Values of type List  ==
 
 
<source lang="java">
 
 
// new dynamic array of size 0
 
vals Int[];             
 
 
// dynamic list, but not instantiated (vals must be instantiated before it can be accessed)
 
vals Int[]?;
 
 
// new dynamic array of size 4; all values set to their default value (0 in this example)             
 
vals Int[] = new Int[4]; 
 
 
// dynamic array, initialized with 4 values
 
names String[] = [ "Paul", "John", "George", "Ringo" ]; 
 
 
// assigns the first index in the array to "Bob"
 
names[1] = "Bob";                             
 
 
// assigns the last index in the array to "Ken"         
 
names[names.getSize()] = "Ken";               
 
 
// new dynamic array of size 0
 
cities String[];             
 
 
// appends a new value to the end of the array           
 
cities.appendElement("Delta");   
 
 
// appends two new values to the end of the list cities.
 
cities.appendAll([ "Denver", "Pueblo" ]); 
 
 
// removes the second value in the array
 
removeElement(2);                 
 
 
// removes all values from the array
 
cities.removeAll();                       
 
</source>
 
 
<br> '''Constants'''
 
 
<source lang="java">
 
// The value is not changeable.
 
const NUMBEROFDAYS Int = 7;
 
 
// The element values are changeable, but the name cannot refer to another list.
 
const MINIMUMNUMBERS INT[] = [1,2,3,4,5];
 
</source>
 
 
<br>
 
 
<br> <br>
 
 
<br>
 

Latest revision as of 11:54, 10 February 2012

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