# Programming in Kotlin: Fundamentals

Aug 9 2022 Kotlin 1.6, Android 12, IntelliJ IDEA CE 2022.1.3

## Part 2: Manage Control Flow

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This video was last updated on Aug 9 2022

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Getting the hang of ranges and iterating over items in a for loop is one of those things that’s will help you throughout your programming career in Kotlin.

``````Challenge 1:
Create a range of 20 numbers, and iterate over it, printing out the numbers.

Challenge 2:
Iterate over the range in Challenge 1 again, but print every third number.

Challenge 3:
Create a decreasing range of 15 numbers, and print every second number.
``````
``````val range = 11..30

for(number in range) {
print("\$number ")
}
``````
``````val range = 11..30

for(number in range step 3) {
print("\$number ")
}
``````
``````val reverseRange = 30 downTo 16

for(number in reverseRange step 2) {
print("\$number ")
}
``````
``````println("...")
``````