A Sharp (.NET)

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The correct title of this article is A# (.NET). The substitution of the # is due to technical restrictions.

A#
Designed byDr. Martin C. Carlisle, Lt Col Ricky Sward, Maj Jeff Humphries
DeveloperAdaCore
First appeared2004; 22 years ago
PlatformCommon Language Infrastructure
OSCross-platform
LicenseGNU General Public License
Websitewww.asharp.martincarlisle.com

A# is a port of the Ada programming language to the Microsoft .NET platform. A# is freely distributed by the Department of Computer Science at the United States Air Force Academy as a service to the Ada community under the terms of the GNU General Public License.[1]

AdaCore took over this development in 2007, and announced "GNAT for .NET", which is a fully supported .NET product with all of the features of A# and more.[2] As of 2021, A# has fallen dramatically in popularity and is considered by some to be a dead language (there are no known users or implementations).[3][unreliable source?][4]

with Ada.Text_IO;
use Ada.Text_IO;
procedure Hello_Dotnet is
begin
 Put_Line(Item => "Hello, world!");
end Hello_Dotnet;

[5]

  1. ^ "Ada for .NET". www.sigada.org. Retrieved 2025-12-29.
  2. ^ Cited by Martin Carlisle (USAFA) https://asharp.martincarlisle.com/ and see also http://www.adacore.com/2007/09/10/adacore-first-to-bring-true-net-integration-to-ada/ Archived 2007-10-28 at the Wayback Machine
  3. ^ Developer, Website (2021-03-10). "The Mysterious Existence of A#". Medium. Retrieved 2021-06-22.
  4. ^ "AdaCore First to Bring True .NET Integration to Ada". AdaCore. 2007-09-10. Retrieved 2025-12-29.
  5. ^ "A#: Multilanguage Programming with Ada in .NET". Retrieved July 1, 2023.[permanent dead link]