Welcome to HCODX Online Compiler
Quick Start:
Ctrl+Enter Run code
Ctrl+S Save / Download
Ctrl+L Clear output
Select a language and start coding.
Compile and run Nim code online instantly with HCODX. Our free cloud-based Nim compiler supports real-time execution, standard input, syntax highlighting, and code download. No installation or configuration required. Start coding in Nim now.
Run Nim instantly without installing any IDEs or configuring environments. Our cloud-based Nim handles libraries, runtimes, and dependencies automatically so you can focus on writing code.
Whether you are studying algorithms in Nim, practicing data structures in Nim, or exploring functional programming, our tool provides real-time stdout/stderr feedback with interactive standard input support.
HCODX is a free online compiler and code runner: write code in your browser, execute it on a cloud sandbox, and interact with your program through a live terminal. Students use it for coursework and interview practice; developers use it to test snippets in 85+ languages without setting up a local environment.
Nim reads like Python but compiles through C to small, fast native binaries, giving you indentation-based syntax with static typing and performance close to hand-written C. The language reached its mature 2.x series (Nim 2.0 shipped in 2023, with 2.2 following), and it runs in production at Status, whose Nimbus Ethereum client is written entirely in Nim. Its macro system operates on the abstract syntax tree, which makes it a favorite for developers who want metaprogramming without C++ template complexity. Here you can execute Nim in an interactive terminal straight from the browser: the program runs for real, output appears as it happens, and readLine calls wait for your keyboard input.
import std/strutils
proc square(n: int): int = n * n
stdout.write("Enter your name: ")
let name = readLine(stdin).strip()
echo "Hello, ", name, "!"
stdout.write("Pick a number: ")
let n = parseInt(readLine(stdin).strip())
echo name, ", the square of ", n, " is ", square(n)
for i in 1..3:
echo "Nim iteration ", iNim fits developers who prototype in Python but need compiled speed: command-line tools, game scripting, scientific computing, and blockchain infrastructure like Status's Nimbus client. Students use it to learn static typing without heavy syntax, since procs, generics, and option types feel approachable coming from Python. Competitive programmers appreciate that Nim solutions run at C-like speed while staying short. It is also used to compile to JavaScript, so web developers experiment with sharing logic between backend binaries and frontend code. HCODX is a free online Nim editor, runner and interpreter — an IDE-grade compiler and playground to write and run code online, execute code with live output and live preview, no downloads or web server required.
Yes. Because the page attaches a real terminal to your running process, readLine(stdin) blocks exactly as it would locally. Your program prints its prompt, waits, and resumes the instant you type a line and press Enter, so multi-step console dialogs, menus, and parseInt-based numeric input all behave naturally.
Programs are built with a Nim 1.x/2.x era toolchain using the default C backend, then executed natively. That means real compiled performance rather than interpretation. Modern language features such as the strutils and sequtils modules, generics, and iterators are available; check compiler output if a very new 2.x-only feature errors.
No, the sandbox compiles one file without network access, so nimble install is unavailable. Nim's standard library is unusually broad, though: JSON parsing, regular expressions, OS routines, math, hashing, and unit testing via std/unittest are all built in, which covers most coursework and algorithm practice without external packages.
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