Repeat function for simple repetition in Kotlin - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of repeat function with print

What is the output of this Kotlin code using the repeat function?

Kotlin

fun main() {
    repeat(3) {
        print("Hi")
    }
}

A 3

B

Hi
Hi
Hi

C HiHiHi

D Hi Hi Hi

💡 Hint

The repeat function runs the block multiple times without adding new lines automatically.

The repeat(3) runs the print statement 3 times consecutively. Since print does not add a newline, the output is 'HiHiHi'.

❓ Predict Output

intermediate

Value of variable after repeat loop

What is the value of sum after running this Kotlin code?

Kotlin

fun main() {
    var sum = 0
    repeat(4) { i ->
        sum += i
    }
    println(sum)
}

A 6

B 10

C 4

D 0

💡 Hint

The repeat function passes the current iteration index starting from 0.

The loop runs 4 times with i = 0,1,2,3. Sum is 0+1+2+3 = 6.

🔧 Debug

advanced

Identify the error in repeat usage

What error does this Kotlin code produce?

Kotlin

fun main() {
    repeat(3)
        println("Hello")
    println("Done")
}

A SyntaxError: Missing braces for repeat block

B No error, prints Hello three times then Done

C RuntimeException: repeat count must be positive

D Compilation error: Indentation error

💡 Hint

In Kotlin, if the block is a single statement, braces are optional.

The repeat function accepts a single statement without braces. It prints 'Hello' three times, then 'Done'.

❓ Predict Output

advanced

Output with nested repeat calls

What is the output of this Kotlin code with nested repeat calls?

Kotlin

fun main() {
    repeat(2) { i ->
        repeat(2) { j ->
            print("${i}${j} ")
        }
    }
}

A 00 01 10 11

B 00 10 01 11

C 0 1 0 1

D 01 00 11 10

💡 Hint

The outer loop runs for i=0,1 and inner for j=0,1 printing pairs.

The code prints pairs of i and j for each nested loop iteration: 00 01 10 11

🧠 Conceptual

expert

Repeat function behavior with zero count

What happens when you call repeat(0) in Kotlin?

A The block runs once with index 0

B Runs infinitely

C Throws IllegalArgumentException

D The block does not run at all

💡 Hint

Think about how many times the block should run if count is zero.

Calling repeat with 0 means the block runs zero times, so it does not execute at all.