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Definition

Ada is a programming language intended for real-time safety-critical systems.

with Ada.Text_IO;

procedure main is
    message : String := "Hello World"
begin
    -- Print message
    Ada.Text_IO.Put_Line( message );
end main;

Data Types

-- type declarations
type Counter_Type is range 1 .. 10;                  -- constrained
subtype Counter_Type is Counter_Type range 1 .. 3;   -- further constrained
type Vector_Type is array (1 .. 3) of Integer;       -- 3 elements

-- instanciations
MyCounter : Counter_Type := 1;
Velocity : Vector_Type := (1, 2, 3);
type Day_type   is range    1 ..   31;
type Month_type is range    1 ..   12;
type Year_type  is range 1800 .. 2100;

type Date is record
   Day   : Day_type;
   Month : Month_type;
   Year  : Year_type;
end record;

References

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