Hello, World! But First, Let’s Install the World...

Here’s a quick installation + "Hello World" guide for Java, Python, C++, and JavaScript—perfect for beginners starting DSA or basic programming.

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1. C++

Installation:

• Windows: Install MinGW or use MSYS2

• Mac: Use Homebrew → brew install gcc

• Linux: sudo apt install g++

Compile & Run:

g++ hello.cpp -o hello
./hello

Hello World:

#include <iostream>
using namespace std;

int main() {
    cout << "Hello World"; 
    return 0;
}

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2. Java

Installation:

• Install Java JDK

• Set JAVA_HOME and add to PATH

Compile & Run:

javac Hello.java
java Hello

Hello World:

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

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3. Python

Installation:

• Download from python.org

• Linux/macOS: Usually comes pre-installed

Run:

python hello.py
# or sometimes: python3 hello.py

Hello World:

print("Hello, World!")

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4. JavaScript

Installation:

• Install Node.js

• Comes with node and npm

Run:

node hello.js

Hello World:

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

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Optional IDEs (All Languages)

• VS Code (Install language extensions for C++, Java, Python, JS)

• Replit (Browser-based IDE for all languages)

• JetBrains IDEs: IntelliJ (Java), CLion (C++), PyCharm (Python), WebStorm (JS)

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