**Course Title:** Kotlin Programming: From Basics to Advanced Techniques **Section Title:** Introduction to Kotlin and Setup **Topic:** Writing your first Kotlin program: Hello, World! ### Overview In this topic, we will dive into the world of Kotlin programming by writing our first Kotlin program. We will cover the basic structure of a Kotlin program, including the main function, and learn how to print output to the console. By the end of this topic, you will be able to write and run your first Kotlin program. ### Writing your first Kotlin program To start with, create a new Kotlin project in your preferred IDE (IntelliJ IDEA or Android Studio). You can refer to the previous topic for instructions on how to set up your development environment. Create a new file called `HelloWorld.kt` and add the following code: ```kotlin fun main() { println("Hello, World!") } ``` Let's break down what's happening in this code: * `fun main()`: This is the main function in Kotlin, which is the entry point of the program. The `fun` keyword is used to declare a function. * `println("Hello, World!")`: This is a function call to `println`, which prints its argument to the console followed by a newline. ### Key Concepts * **Main function**: Every Kotlin program must have a main function, which is the entry point of the program. * **Println function**: `println` is a function that prints its argument to the console followed by a newline. ### Example Use Case You can modify the `println` function to print your name or any other message you want to display. ```kotlin fun main() { println("Hello, my name is John Doe!") } ``` ### Running your first Kotlin program To run your Kotlin program, you can use the following methods: * **Run button**: Click on the green run button next to the main function in IntelliJ IDEA or Android Studio. * **Terminal**: Open a terminal and navigate to the directory where your Kotlin file is located. Run the command `kotlinc HelloWorld.kt -include-runtime -d HelloWorld.jar` to compile and run your program. ### Resources For more information on Kotlin basics, you can refer to the official Kotlin documentation: [Kotlin Official Documentation](https://kotlinlang.org/docs/home.html) If you have any questions or need further clarification on any concept, feel free to ask in the comments section below. ### What's Next? In the next topic, we will cover **Conditional statements: if, when**, where you will learn how to control the flow of your program using if and when statements. Don't forget to stay tuned for the next topic, and keep practicing your Kotlin skills!