Kotlin: Hello World Program

1. Introduction

Starting any new programming language, the classic initiation is the "Hello, World!" program. This simple program is designed to showcase the basic syntax of a language for the first time. In this post, we're diving into Kotlin and its "Hello, World!" program.

2. Program Overview

The main goal of the program is simple: print the phrase "Hello, World!" to the console. While the task is rudimentary, it's an important stepping stone in understanding the foundational syntax of Kotlin.

Now, let's dive into the actual program.

3. Code Program

// This is the main entry point of a Kotlin application
fun main() {
    // Print "Hello, World!" to the console
    println("Hello, World!")
}

Output:

Hello, World!

4. Step By Step Explanation

1. Main Function:

• Every Kotlin application starts its execution from the main function. The fun keyword is used to declare a function in Kotlin.
• The main function does not return anything, and hence there's no return type specified.

2. Printing to the Console:

• Inside the main function, we see the println function. This is Kotlin's built-in function to print something followed by a new line to the standard output, typically the console.
• We pass the string "Hello, World!" as an argument to the println function, which then gets printed.

3. Comments:

• The lines starting with // are comments. These are ignored by the Kotlin compiler and are there for the programmer's benefit. Comments help to describe what a specific part of the code does.

This "Hello, World!" program provides a peek into the simplicity and elegance of Kotlin. While it's the most basic of programs, it paves the way to dive deeper into more complex Kotlin programming tasks.