Welcome to HCODX Online Compiler
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Compile and run D code online instantly with HCODX. Our free cloud-based D compiler supports real-time execution, standard input, syntax highlighting, and code download. No installation or configuration required. Start coding in D now.
Run D instantly without installing any IDEs or configuring environments. Our cloud-based D handles libraries, runtimes, and dependencies automatically so you can focus on writing code.
Whether you are studying algorithms in D, practicing data structures in D, 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.
D is Walter Bright's answer to C++: a compiled systems language with garbage collection you can opt out of, built-in unit tests, contracts, and compile-time function execution that predates most of the industry's metaprogramming trends. First released in 2001 and now maintained alongside the DMD, LDC, and GDC compilers, D runs in production at Weka.io, whose high-performance filesystem is written in it, and at Symmetry Investments. The syntax is immediately readable to anyone who knows C, Java, or C#. This page gives you a live D terminal in the browser: your code compiles and runs on a real process, and readln waits for input you type directly into the streaming output.
import std.stdio;
import std.string;
import std.conv;
import std.algorithm;
import std.range;
void main()
{
write("Enter your name: ");
string name = strip(readln());
writeln("Hello, ", name, "!");
write("Enter a limit: ");
int limit = strip(readln()).to!int;
auto evens = iota(1, limit + 1).filter!(n => n % 2 == 0);
writeln("Even numbers up to ", limit, ": ", evens);
foreach (i; 1 .. 4)
writeln(i, " cubed is ", i * i * i);
}D suits developers who want C++-class performance with faster compile times and cleaner generics, which is why it appears in high-throughput storage systems like Weka.io and in quantitative finance at Symmetry Investments. Students use it to study ranges and lazy evaluation, since std.algorithm chains like filter and map compose without allocations. It is also a practical scripting replacement: rdmd-style quick programs handle text processing with compiled speed, and C programmers exploring safer features test slices, immutability, and built-in unittest blocks here. HCODX is a free online D 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. This is a real terminal session, so readln() blocks the process until you respond. Combine it with std.string.strip to drop the trailing newline and std.conv.to!int for numeric parsing, and you can build interactive menus, quizzes, and step-by-step console programs exactly as you would in a local shell.
Your code is built with the reference DMD compiler toolchain, which compiles quickly and supports the full language including templates, mixins, and compile-time function execution. For maximum optimized speed developers locally often switch to LDC, but for learning, testing snippets, and coursework DMD's behavior is identical where it matters.
No. The sandbox compiles a single self-contained file, so dub dependencies and multi-module projects will not resolve. Phobos, D's standard library, ships with the compiler and includes std.algorithm, std.range, std.regex, std.json, and std.parallelism, which is more than enough for algorithm practice, language exploration, and most university assignments.
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