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! 🎉