statement:
1. type Name = Existing type;
2. type Name = type Existing type; 3. type Name = (EnumValue1 [=value], EnumValue2 [=value] ...); 4. type Name = Expression1..Expression2; 5. type Name = ^Existing type; 6. type Name = array[...] of Existing type; 7. type Name = class ... end; 8. type Name = class of Existing class 9. type Name = dispinterface ... end; 10. type Name = file of Existing type; 11. type Name = function ...; 12. type Name = interface ... end; 13. type Name = object ... end; 14. type Name = procedure ...; 15. type Name = record ... end; 16. type Name = set of Ordinal values
Description: Type keywords is a fundamental part of Delphi, unlike other languages, it allows a new type (species) to create variables and procedures. These new types can be referenced, as if it were part of the language.
For example: Type TCourtCards = (Ace, Jack, Queen, King);
This allows the definition of a "type" new variable: var Card: TCourtCard; Card: = Queen;
Prefix generally in the type name plus "T", which is a useful convention.
1.type Name = Existing type
With reference to a conventional type, such as to replace with a new name string.
2.type Name = type Existing type
The same effect as above, but it ensures that at run time, this type of variable it is recognized as a new type name, rather than pre-existing type name.
3.type Name = (EnumValue1,EnumValue2…)
Definition of an enumerated type, contains the value EnumValue1, EnumValue2 like. It is a user-defined name, list all possible values. These values must be unique in your program, once it is defined in the type, it can only be referenced by two methods: a designation or reference variable of this type; and a sequence number acquired as a digital value by Ord keywords. See examples.
NOTE: These elements, when the definition of the enumeration, its position is 1, 2, etc., unless the value "= value" overwrite. Such as:
Type Days = (Monday = 1,Tuesday,Wed…);
Here, the position value is set catalog on Monday 1, Tuesday is 2, Wednesday 3, and so on.
4.Type Name = Expression1..Expression2
Here is a complete range of integers or characters, from Expression1 expression to Expression2 expression. Expressions 1 and 2 may be the result of a formula calculation result of an integer or a character, or only an integer or character constant. Such as: Type TAlphabet = 'A' .. 'z'; commonly used to define a range of characters, from uppercase to lowercase A z.
5.type Name = ^Existing type
'^' Symbol is a pointer pointing to the conventional type. It is often used for navigation Record type records.
6.type Name = array[…] of existing type
A structure type, new type of package with a certain type of the array.
7.type Name = class…end
Defines the structure of a new class, see Class keyword.
8.type Name = class of existing class
A meta-class definitions, see Class keyword.
9.type Name = dispinterface … end
A dispatch Interface (dispatch interface) type, see Dispinterface keywords.
10.type Name = file of Existing type
A pointer to the type of the file, the file contains records of the given type. (By default, the file contains binary data)
11.type Name = function …
It is defined as a function type, to allow this function is defined as parameters for the subroutine.
12.type Name = interface … end
It is used to define the structure of the interface. See Interface keyword.
13.type Name = object … end
Equivalent to the class definition has been obsolescence.
14.type Name = procedure …
It is defined as a type of process, to allow this process is defined as parameters for the subroutine.
15.type Name = record … end
Recording type, given under the name of the package data structure. See Record keywords.
16.type Name = set of Ordinal values
The number of sub-sector defined order. It defines the range of integers or characters. See Set keyword.
Some examples cited type {} the Type TString1 = String; // the Name = 1. Existing type type TString2 = String type; // the Name type = type 2. Existing type TTemp = (Hot, Warm, Cold); // 3. type = name (Enum1, Enum2 ...) TExpr = 2. 5 .. * *. 6. 3; // type name = 4. Expr1 .. Expr2 // 5. The keyword See the Pointer The TArray = Array [1..3] of byte;.. 6 // Array type the Name = [...] of type // see TFrom1 7. The class definition // 8. see class Image @ 9. see Dispinterface keyword @ 10. see File Key words // Function 11. see Key words // Image Interface 12. See @ 13 out without the @ See Procedure 14. Image trecord = Record the Name = @ 15. A type .. End Record; header : String; value: Integer; End; TLetters of SET = 'a' .. 'Z'; // 16. a type of the Name = SET ordinals var // variables with defined above type firstName: TString1; lastName: TString2; temperature : TTemp; expression The: TExpr; the myArray: TArray; MyRecord: trecord; Letters: TLetters; the begin // assign a variable firstName: = 'Neil'; lastName := 'Moffatt'; temperature := Cold; expression := 10; myArray[1] := 5; myRecord.header := 'data file'; letters := ['F'..'Q']; end;