# Inheritance and interfaces — Kotlin

Source: https://www.geekswithgeeks.com/en/kotlin/kotlin-inheritance

> Explain Inheritance and interfaces, run a focused example, and inspect the result.

## The essential idea

**Inheritance and interfaces** makes a Kotlin program more expressive while keeping the code readable. Identify the value, the rule, and the result before you try to remember the syntax.

## Run a tiny experiment

Read top to bottom, then run the code and use its output as evidence.

```kotlin
// Explore inheritance with one small program.
val value = 0
println(value)
```

Output:

```
0
```

## A practical habit

For **Inheritance and interfaces**, run a very small example and change only one part. The compiler and output will show whether your explanation is correct.

Quick check

**Quiz:** How should you practise Inheritance and interfaces?

- [x] Run a focused small program.
- [ ] Memorize without compiling.
- [ ] Ignore errors.

*Answer:* Run a focused small program.. Small experiments make cause and effect visible.