Run Pascal online

Run Pascal online — Free Pascal 3, Object Pascal, browser-hosted.

Version

Firecracker microVM live per-test verdicts multi-file compile

Pascal is still taught, still used in Delphi codebases, still worth knowing for anyone tracing computer-science history. Free Pascal handles Turbo Pascal syntax and Object Pascal.

Starter code

What you get in Pascal

Clicking "Run now" opens the playground with this exact code and a matching test case pre-loaded — passes on first Run.

pascal

Pascal 3

program Solution;
var n: integer;
begin
  readln(n);
  writeln(n * 2);
end.

stdin →

expected →

FAQ

Common questions about Pascal on ls-judge

Free Pascal or GPC?: Free Pascal 3.x — the actively maintained one.
Delphi mode?: Yes, enable at the top of your source with {$mode Delphi}.
Free?: Yes.
Entry filename?: main.pas.