Writing your first Kotlin program is simple! Follow these steps to create, write, and run your first Kotlin program:

Step 1: Set Up Your Environment

To write Kotlin programs, you need a development environment. The recommended setup is IntelliJ IDEA, which is specifically designed for Kotlin development.

1. Download and Install IntelliJ IDEA:
   • Visit JetBrains’ IntelliJ IDEA.
   • Download the Ultimate Edition (for Java/Kotlin development) or Community Edition (free version).
   • Install it.
2. Install Kotlin Plugin:
   • Kotlin support is built into IntelliJ IDEA. If it’s not already installed, go to: File → Settings → Plugins (Windows/Linux) or IntelliJ IDEA → Preferences → Plugins (Mac).
   • Search for “Kotlin” in the marketplace, and install it.

Step 2: Create a New Kotlin Project

1. Open IntelliJ IDEA and click on:
   • New Project.
2. Select Kotlin under “Languages” or “New Project Wizard.”
   • Choose Kotlin/JVM as the project type.
3. Configure your Project:
   • Specify the project name (e.g., “FirstKotlinApp”).
   • Choose or create a project location.
   • Make sure you add a JDK (Java Development Kit). If not installed, download a JDK from AdoptOpenJDK or Oracle JDK.
4. Click Finish to create the project.

Step 3: Write Your First Kotlin Code

1. In the src folder, create a new Kotlin file:
   • Right-click src → New → Kotlin File/Class.
   • Name it something like HelloWorld.

2. Write your Kotlin code. Here’s your first program:

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

Step 4: Run Your Program

1. Run the program by clicking the green play icon next to the main function or at the top of the editor.
2. Alternatively, run it by right-clicking the file and selecting:
   • Run 'HelloWorldKt'.
3. You should see the output in the Run Tool Window at the bottom of the IDE:

   Hello, Kotlin!
   

Understanding the Code

• fun: This keyword defines a function.
• main: This is the entry point of the program, similar to main in Java.
• println: A function that prints a line of text to the console.

Congratulations!

You’ve successfully written and executed your first Kotlin program!