Hello World in Development: What It Is and the Origin of the Tradition

What Is Hello World in Programming

Hello World is a simple program whose sole purpose is to output the string “Hello, World!” or a similar greeting on the screen. It serves as the first step when learning a new programming language.

A beginner who writes Hello World checks three things: whether the compiler or interpreter is installed, whether the development environment is configured correctly, and whether the basic syntax of the language is understood. If the program runs without errors — you can move on.

According to the Stack Overflow Developer Survey 2024, more than 65% of respondents started learning their first language with Hello World. This program has become an unofficial standard for entering programming.

Why Do You Need a Hello World Program

Minimal verification of tools is the key task of Hello World. Without it, a developer cannot be sure that their environment is set up correctly.

When switching languages or frameworks, Hello World allows you to verify within 5 minutes that all dependencies are installed. For example, when switching from Java to Kotlin, the first program shows whether the Kotlin compiler is working.

Hello World as a Ritual

The cultural significance of Hello World goes beyond technical necessity. Millions of developers started with this phrase, making it a unifying symbol of the profession.

Over time, Hello World has turned into a meme and a subject for creativity: there are implementations in esoteric languages, as a QR code, on an oscilloscope, and even on a microwave oven.

History of the Hello World Term

The first documented appearance of the phrase “Hello, World!” in programming dates back to 1972. Brian Kernighan used it in a tutorial example for the B language, the predecessor of C.

In 1978, Kernighan and Dennis Ritchie published the book “The C Programming Language” (K&R C), where the Hello World example appeared on page 6. It was this publication that cemented the tradition for decades.

According to the Computer History Museum, the original code looked like this: main() { printf(“hello, world”); } — without a return type, without header files, and in lowercase. In subsequent editions, the example was updated to ANSI C.

Why Hello World Specifically

The phrase was chosen by chance — Kernighan wanted to demonstrate string output, and the first thing that came to mind was greeting the world. No deep meaning or references were intended.

However, over time Hello World acquired symbolic meaning: a programmer “greets” a new language and the developer community. According to GitHub Octoverse 2024, repositories with Hello World examples are among the top 100 most forked.

Evolution of Hello World

Over 50 years, Hello World has evolved from a simple text output to multi-platform examples with a graphical interface. Modern Hello World programs for mobile applications include creating an Activity or ViewController.

On the Android platform, a minimal Hello World requires a layout file, Activity, and manifest — about 50 lines of code. For iOS with SwiftUI, a single file suffices: Text(“Hello, World!”).

Structure of the Hello World Program

All Hello World implementations, regardless of language, contain three common elements: an entry point, an output statement, and a text string. Only the syntax differs.

In compiled languages (C, C++, Java, Kotlin), a main function or class declaration is required. In interpreted languages (Python, Ruby, JavaScript), a single line is enough — the runtime environment knows where to start.

According to a GitHub analysis for 2024, the average number of lines in Hello World for 50 popular languages is 3.7 lines. The shortest is in Ruby (1 line), the longest is in Java (7 lines including the class).

Program Entry Point

The entry point is where program execution begins. In C and Java it’s the main function, in Python it’s the first line of the file, in Swift it’s the @main attribute or manual entry point.

An error in defining the entry point is the most common problem for beginners. According to Stack Overflow, questions tagged “how to run the first program” gather over 50 thousand views per month.

Output Statement

Text output is the second mandatory part of Hello World. Different languages use different functions: printf in C, System.out.println in Java, print in Python, console.log in JavaScript.

Understanding the difference between stdout and stderr output comes later, but Hello World already introduces the concept of I/O streams. Built-in output functions exist in all languages without exception.

Hello World Examples for Popular Languages

Let’s look at Hello World implementations for 5 languages that are in the top 10 of the TIOBE index for 2025: Python, Java, JavaScript, C#, and Kotlin. Each example demonstrates syntactic features.

The examples are sorted from the shortest to the most verbose. This helps to see how different languages solve the same problem with minimal means.

Hello World in Python

print("Hello, World!")

The shortest implementation. One line without a semicolon. Python automatically adds a newline. For a beginner, this is the minimum entry threshold.

Hello World in Java

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

Java requires a class with a main method. For a beginner, this is a lot of “magic” — the public static void modifiers are not yet clear. But Hello World helps to get used to strict typing.

Hello World in JavaScript

console.log("Hello, World!");

Like Python, JavaScript allows you to get by with a single line. The difference is the mandatory semicolon (although formally it’s optional) and the use of console.log instead of print.

Hello World in C#

using System;

class Program {
    static void Main() {
        Console.WriteLine("Hello, World!");
    }
}

The syntax of C# is similar to Java, but there are nuances: the using System directive, capital M in Main, and Console.WriteLine. Hello World in C# introduces namespaces.

Hello World in Kotlin

fun main() {
    println("Hello, World!")
}

Kotlin is a modern compiled language, but Hello World takes only 3 lines. The main function is declared outside a class, and println is a global function, which simplifies the entry.

Where Hello World Is Used Besides Learning

The scope of Hello World application extends far beyond educational tasks. Professional developers use it to check tools, test environments, and even in documentation.

In continuous integration (CI/CD), Hello World projects often serve as minimal pipeline tests: if the Hello World build passes, then the basic environment is configured correctly. According to the JetBrains Developer Survey 2024, 38% of teams use Hello World for CI diagnostics.

Checking Frameworks and Libraries

When connecting a new library or framework, the Hello World example from the official documentation is the first step. It confirms that dependencies are resolved, imports work, and the API is available.

For example, for React Native, the official Hello World is a component with text. If it displays on the emulator, then the development environment is set up correctly and you can proceed to the real task.

Testing Development Tools

Hello World is used to check linters, formatters, and build systems. When setting up ESLint or SwiftLint, the first run on a Hello World file shows whether the rules work correctly.

According to GitHub, the “hello-world” repository by GitHub (created in 2008) has over 2.5 million forks. It is the most forked repository on the platform, used as a testing ground for Git commands.