Print and println output in Kotlin - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of print and println combination

What is the output of this Kotlin code snippet?

Kotlin

fun main() {
    print("Hello")
    println("World")
    print("!")
}

A

HelloWorld!

B

HelloWorld
!

C

Hello
World
!

D

Hello
World!

💡 Hint

Remember that print does not add a new line, but println does.

The first print outputs "Hello" without a newline. Then println outputs "World" and adds a newline. Finally, print outputs "!" without a newline. So the combined output is "HelloWorld!" followed by a newline.

❓ Predict Output

intermediate

Output with multiple println calls

What will this Kotlin program print?

Kotlin

fun main() {
    println("A")
    println("B")
    println("C")
}

A

C
B
A

B

A
B
C

C ABC

D A B C

💡 Hint

Each println adds a newline after printing.

Each println prints the string and then moves to a new line. So the output is A, then newline, B, newline, C, newline.

🧠 Conceptual

advanced

Difference between print and println

Which statement best describes the difference between print() and println() in Kotlin?

A print() outputs text with a newline; println() outputs text without a newline.

B Both print() and println() output text with a newline at the end.

C print() outputs text without a newline; println() outputs text with a newline at the end.

D Both print() and println() output text without a newline.

💡 Hint

Think about what happens after the text is printed.

print() writes text to the output without moving to a new line, so the next output continues on the same line. println() writes text and then moves to the next line.

❓ Predict Output

advanced

Output of mixed print and println with variables

What is the output of this Kotlin code?

Kotlin

fun main() {
    val x = 5
    print("x = $x")
    println(", x squared = ${x * x}")
    print("Done")
}

A

x = 5, x squared = 25
Done

B x = 5, x squared = 25Done

C

x = 5
, x squared = 25
Done

D

x = 5
, x squared = 25Done

💡 Hint

Remember where println adds a newline.

print("x = $x") outputs "x = 5" without newline. println then outputs ", x squared = 25" and adds a newline. Finally, print("Done") outputs "Done" on the new line.

❓ Predict Output

expert

Output of nested print and println calls

What is the output of this Kotlin program?

Kotlin

fun main() {
    print("Start")
    println()
    print("End")
}

A StartEnd

B

Start
End

C

Start
 End

D

Start

End

💡 Hint

What does println() with no arguments do?

print("Start") outputs "Start" with no newline. println() with no arguments outputs just a newline. Then print("End") outputs "End" on the new line. So output is Start, newline, newline, End.

Practice

1. What is the main difference between print and println in Kotlin?

easy

A. print outputs only numbers; println outputs only text.

B. print adds a newline after output; println outputs text without a newline.

C. print outputs text without a newline; println adds a newline after output.

D. print is used for debugging; println is used for user messages.

Solution

1. Step 1: Understand print behavior

   print outputs text exactly as given and stays on the same line.

2. Step 2: Understand println behavior

   println outputs text and then moves the cursor to the next line.

3. Final Answer:

   print outputs text without a newline; println adds a newline after output. -> Option C

4. Quick Check:

   print no newline, println newline = A [OK]

Hint: Remember: println adds a line break, print does not [OK]

Common Mistakes:

• Confusing which function adds a newline
• Thinking print adds a newline
• Assuming println outputs only numbers

2. Which of the following is the correct syntax to print "Hello" and then move to a new line in Kotlin?

easy

A. println("Hello")

B. print("Hello")

C. println Hello

D. println["Hello"]

Solution

1. Step 1: Check syntax correctness

   Only println("Hello") uses correct function call syntax with parentheses and quotes.

2. Step 2: Verify output behavior

   println("Hello") prints "Hello" and moves to a new line automatically.

3. Final Answer:

   println("Hello") -> Option A

4. Quick Check:

   Correct syntax with println = A [OK]

Hint: Use parentheses and quotes exactly for print/println [OK]

Common Mistakes:

• Missing parentheses around arguments
• Using square brackets instead of parentheses
• Omitting quotes around strings

3. What will be the output of the following Kotlin code?

print("Hi")
println(" there")
print("Welcome")

medium

A. Hi there
Welcome

B. Hi
there
Welcome

C. Hi there Welcome

D. Hi there
Welcome

Solution

1. Step 1: Trace first print statement

   print("Hi") outputs "Hi" without newline.

2. Step 2: Trace println statement

   println(" there") outputs " there" and moves to next line.

3. Step 3: Trace last print statement

   print("Welcome") outputs "Welcome" on the new line.

4. Final Answer:

   Hi there Welcome -> Option D

5. Quick Check:

   print no newline, println newline = D [OK]

Hint: Remember print stays on line; println moves to next line [OK]

Common Mistakes:

• Assuming print adds newline
• Ignoring space in " there"
• Thinking all output is on one line

4. Identify the error in this Kotlin code snippet:

print("Hello")
println "World"

medium

A. Missing parentheses in println call

B. Missing quotes around Hello

C. print cannot be used without println

D. No error, code runs fine

Solution

1. Step 1: Check syntax of print statement

   print("Hello") is correct with parentheses and quotes.

2. Step 2: Check syntax of println statement

   println "World" is missing parentheses around the argument, which is required in Kotlin.

3. Final Answer:

   Missing parentheses in println call -> Option A

4. Quick Check:

   Function calls need parentheses = B [OK]

Hint: Always use parentheses for function calls in Kotlin [OK]

Common Mistakes:

• Omitting parentheses in function calls
• Thinking print needs println to work
• Confusing quotes usage

5. You want to print the numbers 1, 2, and 3 on the same line separated by spaces, then print "Done" on the next line. Which Kotlin code achieves this?

hard

A. print("1 2 3")
print("Done")

B. print("1 2 3")
println("Done")

C. print("1 ")
print("2 ")
print("3\n")
println("Done")

D. println("1")
println("2")
println("3")
print("Done")

Solution

1. Step 1: Print numbers on same line with spaces

   Using print("1 2 3") outputs "1 2 3" on the same line.

2. Step 2: Print "Done" on next line

   println("Done") prints "Done" and moves to the next line.

3. Final Answer:

   print("1 2 3") println("Done") -> Option B

4. Quick Check:

   Use print for same line, println for new line = A [OK]

Hint: Use print for same line, println to move to next line [OK]

Common Mistakes:

• Using println for each number causing new lines
• Using print after println without newline
• Adding \n inside print incorrectly