Program structure and output

An Ada main program is a parameterless procedure: procedure Hello is begin ... end Hello;.

with Ada.Text_IO; makes a library package available; use Ada.Text_IO; lets you drop the prefix.

Put prints without a newline, Put_Line with one, New_Line prints a bare newline.

Build and run with GNAT: gnatmake hello.adb && ./hello. The file name should match the unit name in lowercase.

Ada is case-insensitive; comments start with --. Statements end with ;.

with Ada.Text_IO; use Ada.Text_IO;

procedure Hello is
begin
   Put_Line ("Hello from Ada");
   Put ("same ");
   Put ("line");
   New_Line;
   Ada.Text_IO.Put_Line ("fully qualified call");
end Hello;