Summary - Loops

Combine for, while and range to write a multiplication table.

Summary - Loops

In this summary you'll combine for, while and ranges to build a multiplication table. In previous lessons you learned:

counted loops with for (i in 1..5)
conditional loops with while
at-least-once loops with do-while
ranges with 1..5, until, downTo

We'll do two mini tasks: print a row of the multiplication table (for + range) and count down (while).

Exercise 3 times table

Write a fun main(). Use a for (i in 1..5) loop to print println("3 x $i = ${3 * i}"). Output: 3 x 1 = 3, 3 x 2 = 6, ..., 3 x 5 = 15.

Show example solution

fun main() {
    for (i in 1..5) {
        println("3 x $i = ${3 * i}")
    }
}

Exercise Count down with while

Write a fun main(). Assign 5 to var n. Use a while (n > 0) loop to print println(n) and decrease with n = n - 1 each step. The output should be 5, 4, 3, 2, 1.

Show example solution

fun main() {
    var n = 5
    while (n > 0) {
        println(n)
        n = n - 1
    }
}

Test yourself

Which range counts 1 to 5 (5 inclusive)?
- 1 until 5
- 1..5
- 5 downTo 1
- 1..4
Show answer

1..5 — 1..5 includes both ends: 1, 2, 3, 4, 5.

Complete the range

for (i in 1____5) { println("3 x $i = ${3 * i}") }

Show answer

for (i in 1..5) { println("3 x $i = ${3 * i}") }

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