Tcl · online compiler

Run Tcl online

Run Tcl 8 online — the "everything is a string" language.

Version

Firecracker microVM live per-test verdicts multi-file compile

Tcl is the tool command language: absurdly regular syntax (everything is a command, every argument is a string), classic embedding host (EDA tools, Expect scripts, Tk GUIs).

Starter code

What you get in Tcl

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

tcl

Tcl 8

set n [gets stdin]
puts [expr {$n * 2}]

stdin →

expected →

FAQ

Common questions about Tcl on ls-judge

Tcl 8 or 9?: Tcl 8.x.
Tk (GUI)?: No — sandbox is headless.
Free?: Yes.
Entry filename?: main.tcl.