Kotlin-Fundamentals

Hello World in Kotlin

Every programming journey starts with Hello World. Let’s write our first Kotlin program.

The Code

Create a file named Hello.kt:

1
2
3

fun main() {
    println("Hello, World!")
} …

Variables and Types in Kotlin

Kotlin’s type system is one of its defining features. It combines the safety of static typing with the convenience of type inference, so you rarely need to write explicit type annotations while …

Operators in Kotlin

Operators are the building blocks of expressions in any programming language. Kotlin provides a rich set of operators that go beyond the standard arithmetic and logical operators you’d expect …

Control Flow in Kotlin

Control flow is how a program decides what to do next: which branch to take, which block to repeat, and when to stop. Kotlin keeps the familiar if, for, and while from Java but reshapes them around …

Functions in Kotlin

Functions are the building blocks of any Kotlin program. They let you package logic into reusable, named units, give it clear inputs and outputs, and compose larger programs out of small, testable …

I/O Operations in Kotlin

Input and output are how a program talks to the outside world—printing results, reading what a user types, and moving data in and out of files. You already met println() in Hello World; this tutorial …