# Loops and ranges — Kotlin

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

> Explain Loops and ranges, run a focused example, and inspect the result.

## The essential idea

**Loops and ranges** 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.

## Trace the loop

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

```kotlin
var sum = 0
for (n in 1..3) {
    sum += n
}
println(sum)
```

Output:

```
6
```

- Line 1: The accumulator starts before the range yields a value.
- Line 2: The inclusive range gives 1 first.
- Line 3: The body updates the running total.
- Line 5: The range ends after 3 and the final total prints.

## A practical habit

For **Loops and ranges**, 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 Loops and ranges?

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

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