3.6.3 String Types

1. A one-dimensional array type whose component type is a character type is called a string type.
2. There are two predefined string types, String and Wide_String, each indexed by values of the predefined subtype Positive; these are declared in the visible part of package Standard:

3. subtype Positive is Integer range 1 .. Integer'Last;
   

4. type String is array(Positive range <>) of Character;
   type Wide_String is array(Positive range <>) of Wide_Character;
   

   
   

   NOTES
   

5. (49) String literals, See section 2.6 String Literals, and See section 4.2 Literals, are defined for all string types. The concatenation operator & is predefined for string types, as for all nonlimited one-dimensional array types. The ordering operators <, <=, >, and >= are predefined for string types, as for all one-dimensional discrete array types; these ordering operators correspond to lexicographic order, See section 4.5.2 Relational Operators and Membership Tests.
   Examples
   
6. Examples of string objects:

7. Stars      : String(1 .. 120) := (1 .. 120 => '*' );
   Question   : constant String  := "How many characters?";
   --  Question'First = 1, Question'Last = 20
   --  Question'Length = 20 (the number of characters)
   

8. Ask_Twice  : String  := Question & Question;
   --  constrained to (1..40)
   
   Ninety_Six : constant Roman   := "XCVI";
   --  See section 3.5.2 Character Types, and See section 3.6 Array Types
   

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